Great through a huge range of temps
920475
Bought this for a trip to Colombia. Wore it nearly every day. Slight chill to downright chilly worked great. Wore it when it was pretty warm out too, and it was great. Love it! Pretty thin, so know you'll want a vest over or a t-shirt/tank under.
4070684
I want to share my review, as this is a big ticket item for me. Before I start, a few caveats:
- I bought this because I'm a very hot sleeper
- I live alone, so don't share my bed with anyone (except my pets)
- I live in SC where it's hot and humid most of the time
I decided to get this because regardless of what I did, I woke up sweaty. In the summer, I would set my thermostat to 65 and still wake up sweaty. This is not because of hot flashes! So I decided to get this in the hopes of saving on my electric bill in the summer.

It was easy to set up. I read the book and followed the instructions step by step. It wasn't difficult at all. I was nervous for a minute that it wouldn't slide under the bed, but it *just* fits underneath. If my bedroom wasn't carpeted, it would likely fit a bit better. At this time of year (it's February), I'm sometimes cold when I go to bed. This is perfect for warming the bed or my feet when I get in. I use the Sleep Cycle to set it to turn on about 1.5 hours into my sleep. I then have it turn on to run at the lowest heated setting (72 degrees) at about 40% wind current. I found the cool setting to be too cool my first two nights. I have a feeling that will change in the summer and I will use the cool setting. I am sleeping better and waking up not dripping with sweat! Finally - this is what I've been looking for to keep me cool at night! (And warm if I need it!)

Other things to note:
- it's very quiet. I sleep with a white noise machine and can't hear the BedJet at all
- it can dry your skin out, so I lotion up before I go to bed; if you have a severe dry skin condition, this may not be good for you
- I'm using 100% cotton sheets and it works for me; the company recommends high quality sheets. I don't know if 100% cotton counts as high quality, but that's what I have because they were the ones that kept me the coolest.
4291421
I would rate five star (but still a wonderful value)  except that the temp goes from 65 to 70 to 75.  70 is too hot, 65 too cold.  It would be nice if it had 68 degrees.

Anyway, I've been using this a lot and it is great.  Secondly, they are selling these a lot cheaper elsewhere.
1224452
We bought these before a trip to Greece in July. While touring the various ruins, the temps were in the upper 90s at times, with humidity around 30-50%. We had various cooling and hydration options, and by far the Chilly Pads were the hands-down winners. They got instantly cool upon wetting and stayed that way for much longer than expected. I'm now a true believer.

That said, coming back home to similar temps, but much higher humidity (80-100%), they don't work so well, since they're based on evaporative cooling. So, don't expect magic if you're practically swimming as you walk down the sidewalk.
527443
I was tired of always having large heatsinks bulking up the heart of my PCs, so I decided to try one of these for a bit of a cleaner look. Anyway, the cooler kept my CPU running at a nice 30 degrees C while under no load, and averaging about 44 degrees C while gaming.

The one gripe I have is with the SP120L's that come with it. Under load, these things would crank up and be quite noisy. I have a good tolerance for fan noise because my old build had some loud fans, but these had a higher pitched noise that just rubbed me the wrong way (kind of sounded like a hair dryer on low setting). Anyway, I replaced them with Noctua NF-F12's. Temperature averages went up about 2 degrees C, though I feel that the change is nominal, and the HUGE difference in sound produced made the swap highly valuable.
2521517
I bought this to replace a cheap Haier model that could barely take 5 degrees off the outside temp in my house. Our house is 900 sq/ft so I realize that I'm overworking a single window a/c, but this LG model absolutely rocks. It's well over 90 degrees outside and a comfortable 72 inside with the a/c set at 65 and fan on medium. We have had weeks of 90-100 degree highs and this a/c has been a life saver. This was the largest unit I could fit in the short/wide window I have in my kitchen and while it is fairly undersized based on specs it really does a great job. The energy saver mode is nice also, we leave it on all night and it barely runs other than turning on briefly to check the temperature.

I should add that when I received this it was packaged in it's own box upside down in the shipping box. This made the "This Side Up" arrows actually facing the unit upside down. I just left it sitting upright for the entire day before using it and had no issues, but it really should be packaged correctly.
4121938
high quality, good looks, low temps, cant ask for more
1019708
I live in a desert area that can have a regular high of 118F.  :\  2 of the bedrooms are right over the garage and walkway to our home, so they catch a lot of the heat.  Thermal curtains only work so much.  Both rooms have fans in them, but it would just push around the hot air.  This fan actually keeps the room cool and to be quite honest, these fans worked better than the ceiling fan!  After purchasing the first fan and how great it was, I straight away bought a second one.  You can't beat the price.  They are a bit loud, but no more than a regular fan would be.  There is no other fan I'd choose after having these.
4380598
I went from a quad core APU to this things, and it was an amazing transition, Handles everything I throw at it with just the stock cooler without any issues. Constantly sitting well with in range for heat even under heavy load.
233636
The overall outcome is amazing. The unit uses a fan to control airflow, which regulates how much oxygen the fire receives.  Once dialed in, the Guru holds a fairly steady temp +/- 10 degrees or so.

It can be a little finicky, but once you get used to it,  the Guru performs quite admirably. With the dampener on the Guru set on the first notch and the top Akorn exhaust wheel open just a crack, I seem to have found my particular sweet spot.

I usually set the initial temp a little lower than my actual target temp, seeing as the Guru overshoots by around 10-15 degrees. Example: If I'm shooting for 225 deg, I'll set it at 200 deg. The unit will climb and level out at 215 or so. Then I will set at 225, and the temp will rise without over shooting too much. It is highly advised to start lower than expected,  because if the temp rises much higher than desired,  it takes FOREVER for the temp to come down,  as the Akorn holds heat very well.

I gave a four star review for a few little quirks,  none of which are a deal breaker. First, the mounting slider to which the fan mounts to,  does not fit perfectly onto the Akorn. The slider does not move easily,  and sometimes can be quite difficult to move. Second,  due to the slightly incorrect fit,  the slider allows quite a bit of air/smoke to escape. However,  these complaints are subjective,  and may vary according to your particular Akorn and/or Guru.

All that aside,  I highly recommend the Guru.  Temp control,  especially lower temps for smoking can be quite difficult to maintain,  and the Guru performs quite well.  Once dialed in,  you can rest easy that your temp will remain +/- 10 degrees from your target.

Pros:
Ease of installation and use.
Very good temp regulation.
Temp probes are accurate as verified with other temp probes.
Unit seems durable and well built.

Cons:
Mounting slider doesn't fit very well and allows some air/smoke to escape (maybe it's just mine).
Unit overshoots temp by around 10-15 degrees (start slow).
Guru is a little pricey... However,  if you are looking for a set and forget experience,  it's probably worth it (I have no regrets).

Overall,  the Guru works wonderfully and I would recommend it to anyone who needs to maintain low and slow temps. HIGHLY RECOMMENDED!
2864996
I first found out about this heatsink when it was still just a rumor.  I was considering the Ultra 120 Extreme, but was pretty sure it wouldn't fit in my case.  The few reviews I could find were encouraging, showed it was comparable to the 120.  When I finally got one (they're hard to find) I slapped it on my Core 2 Duo E6550 with Arctic Silver 5 thermal paste.  Got it overclocked to 3.15 GHz (from 2.33 stock) and idle temperatures are around 27 C, load temps about 38 C.  Runs for days on end and temp never even approaches a danger zone.  I use a push-pull 2-fan setup with 120mm fans pointing toward the rear case exhaust fan.  Recently switched from Arctic Silver to Innovation Cooling's IC Diamond 7 Carat thermal paste and shaved another 3-4 degrees off.  If you don't have room for a 120, and you can miraculously find an Ultima 90, it's a real asset.
578540
I've had this heater for about 7 months now, and used it as a primary heating device through the winter time, and I've got to say, this little guy packs a serious punch! It headed a 10x8 room EXTREMELY well, to the point where I had to keep it on very low to avoid over-heating the room.

The second room it heated was a 14x8 room, which it also heated EXTREMELY well. Again, it was almost always set to nearly the lowest possible setting.

Lastly, it's been heating a 14x17 room, and I alternate between a low-fan-high-heat, and hi-fan-low-heat setting, as needed. In any case, it still works very very well.

It has been run for easily 1200 hours since purchase, and is still going strong!

A phenomenal purchase that I'd gladly make again. If this thing ever dies, I'm buying another.
1610763
Have had three of these in different houses, all professionally installed, and absolutely love them. 5 years into the current one. Spectacular performance, set it to 130 degrees, and haven't had a problem with guests showering, the dishwasher and kitchen all running at the same time.
2223256
Very nice powerhouse of a card. I've been using it for almost a week now. It's quiet, and performs very well. Temperatures never get above 65 degrees Celsius when gaming. When not using any GPU intensive tasks, it idles around 30-40 degrees, I've been running games on max settings on a 1080p display with 120+ constant FPS. I'm not into 4K HD yet, so I can't comment on performance there.
4189526
This heat sink is big, but well worth it!! Brought my 95tdp i7-870 from 75c (on a stock cooler) to an awesome 59c(While gaming in MAX). The back plate didn't work well with my MB though, I had to totally dismantle the CPU housing and reposition the CPU housing plate from the back of the heat sink plate to the front. because the hyper 212 led didn't have the appropriate holes to match. When mounting the 212's back plate over my cpu back plate, the female inserts barely came through the MB. It was a difficult attach, because i had to use a torch wrench to make sure all sides were even, as the heat sink leaned as tightening. All and all, even with maybe not a perfect thermal compound laid, i still see awesome temps 4stars!
465148
This is a fantastic card, but like most cards, it is not without issues...

Firstly it does get hot under high stress and you will need to adjust the fan speed manually to keep it running optimally, but even under full utilization of the card, it does not exceed 65*C in my rig, which is a very high airflow rig.

UPDATE: I have now had this card for 7 months still going strong, I have upgraded my PSU and Case fans since and my whole rig is pretty silent, under 20dBA by my guess. (Seasonic Prime 850W PSU, dead silent, Corsair ML140 fans set to 800RPM, dead silent) So when I changed out these fans I noticed that this card does have an extremely annoying problem which may or may not bother some users, but at idle (under 30% load or so) the fans will spin up hard (much more than necessary) and stop in a cycle which is extremely annoying. This is easily fixed with a custom fan profile, I like MSI: Afterburner so I use that. You MUST keep the fans at least at 30% to keep the spin up cycle from happening. Mine is set to be at 30% until 39C and then it spins up at the same percentile as the degree number. With the profile set like that my card very rarely goes over 55C and is barely audible with headphones on, without phones it gets a little annoying. The fans ARE NOT audible until about 50% or so, if you can manage to keep the fans speeds under that level without the temp going over 65C you will be very happy.

The second, and only real issue is that this card is MASSIVE, it WILL require you to buy or rig a brace, there is a risk of damaging the PCI-e slot on your motherboard without it.

All that being said this card is fantastic and I have not had a single major problem with it so far, it runs almost everything at maxed out settings at 3440x1440 @100Hz resolution, save extremely GPU heavy games, but that speaks more of the chip and the overclock than anything.

The RGB lighting is limited but very nice and the monster card adds a little bit of awe to my rig.
The yellow stripe is a huge distraction from my otherwise Blue, Black, and Silver scheme.

As much as I love Zotac and the AMP! Extreme edition I am not 100% sure I will upgrading to the 1080 Ti version if these problems persist in the 1080 Ti AE, other manufacturers seemed to have step up their game significantly and I think I would sacrifice 1-3 fps for a card that will run cooler and quieter, even if it doesn't look as great in my rig. As far as looks goes Zotac still has the best looking card for the 1080 Ti.
1355317
I've only used these about 6-10 times, but thus far they are superb! I've biked in -15 degree wind chills with a baselayer underneath and have been golden! I was shocked at how well these fit (snug) and how warm they've kept me. My only concern is longevity as I try to commute daily regardless of weather...given that sometimes going the cheap route can bite you in this area, I'm naturally suspicious :) Thus far, they have rocked! I'll try to report back at the end of the colder season if anything develops, but I think these are a steal of a deal.