Works fine in an awful environment
596776
I'm currently based in Iraq where the air is dirty & foul.  Though this is definitely not industrial strength, it does a decent job & is reasonable quiet.
4737373
It's okay.  The temp varies a lot with use. Doesn't have very quick recovery.  But it does work when it's hot.
1530938
I was using this in my garage for about two weeks to help keep things a little more comfortable while working on my cars.  I live in a very hot, but low humidity climate, the garage regularly gets to 115-120 degrees during the day/afternoon, and stays easily in the 105 range until well past midnight.

Following the instructions in the manual, keeping it in A/C mode with high fan speed at the lowest temperature setting and the exhaust pipe fully outside the garage it would actually cool the air approximately 20% of the time, and blow hot un-cooled air 80% of the time.  During the cooling times it was great, but the other 4/5ths of the time it's miserable with air even hotter than ambient blowing on you.

Looking in the manual for any troubleshooting tips, the only Problem/Cause/Solution that seems to fit my scenario is:
Problem: "The Air Conditioner does not cool as it should "
Cause:  "The room may be too warm"
Solution: "Please allow time for the room to cool down after turning on the air conditioner".

Call me crazy, but the reason I bought this item was BECAUSE it's HOT.  Maybe I'm being unfair, and the garage heat is too much to expect this unit to operate properly, but it doesn't meet my needs so it's going back.
1493988
Works great! Even in Sub zero weather conditions.
1558622
Survives even in a warm room but may not be too reliable in such environment - may need reboot sometimes.
In a cool room, working continuously for about 3 tears.
User friendlu menus.
4520035
Works great in warm weather, if you you need to use it at 20F and belo - you might have a problem
4150651
It is great when it works but under really high temps, it won't work. It causes an error where it is not sensed by the SD card reader under higher than normal temperature. i.e. writing large files will heat up the micro SD card and suddenly unmount in the system.
2183748
works well, as advertised, not so great on weather channel bands
3436853
Note: I am using this for audio only; I have no idea how well the video function works.

My initial plan upon purchasing my new home was to wire it for multiroom audio.  These work well enough that I probably won't do that any time soon.

I bought these for a party.  I wanted to have at least three zones, the living room, basement, and garage.  Range is decent but keep in mind that each wall will attenuate the signal appreciably.  I have no idea if you could really get hundreds of meters out of these; maybe in an open field but the range in a home will be much less.  When I had the receiver on the close side of the garage, it worked fine, on the far side (3 car, further but no additional walls) it didn't really work at all.

Some things to keep in mind:
These do not have "diversity reception" or anything like that (even cheap wireless mics usually will).  This means that you CANNOT have them at any old angle or position and expect them to work perfectly.  Wireless mics are designed to be tolerant of position and angle, these are not in the slightest.  That's no problem though, just set them up and tweak the position and antenna, and don't move it.
Human bodies will disrupt the signal -- place them so that people aren't likely to walk across the signal path and you'll be fine.
Work best with a strong input signal -- Cellphone headphone jacks are notorious for having weakish output into line in.  If you use one for this, you will need to turn it up more on the receiving end, which means you are turning up the hiss as well.  Use a laptop or place a mixer or preamp after your cellphone to boost the signal.  There is hiss from this system but its not a significant issue if the input signal is strong.
761743
Works just fine for me. Using 8 AA batteries and voltage is good on the output. I took one star off, though, because the pos and neg wires that are hardwired into this thing just aren't that great.
1421822
These work pretty good inside, but as others have noted they are horrible outside.  Inside I get really good range, I often walk to other rooms in the house and don't realize I left my phone behind.  Outside is a completely different story; I have to hold the phone less than a foot or two away otherwise I get super choppy audio.

It's been several months and the battery life is still pretty good.

Personally the fit is not optimal for my ear.  They stay in very well, but if I wear for extended periods the back of the plastic housing makes my ear sore from the pressure.

Bottom line, I think they are decent for the money if you want to use them indoors for working out, etc., but if you want to use them outside then you need to keep looking.
993999
This works well for me but I am in an urban area so my experience does not apply to rural installations.
114036
I live in very humid area and use this in a safe that doesn't have an internal power source. Works like a charm, and only needs plugging in to reset every month or so. I don't think it would be effective in a full room size area, but certainly should be a good option for a closet or cupboard.
3792049
I've been using this device for a few months, and it works well. There's a hitch, though: TRENDnet warns you that it won't work if plugged in to a surge protector, and they're right. I conducting a few tests with just one endpoint in a surge protector, and performance degraded to near-unusable.

This is a pretty serious problem. If there is a power surge, it could in theory go into the unprotected TRENDnet device, and right through the ethernet cable into your computer. Using this device therefore renders your computer's surge protector more or less useless.

I bought an APC PNET1GB ethernet surge protector to go along with each TRENDnet device. That should solve the problem, but it does raise the cost of this approach significantly. Be warned!
2076935
I've had this thing plugged into a laptop for over a year now without shutting the laptop off and haven't had much of any issue with this drive. Some tuning to have Windows manually turn off the hard drive after a few minutes and voila! The lack of ventilation is potentially a big problem, but you should be just fine as long you keep the room's temperature in the low 20s (Celsius). So far, the drive has been doing just fine serving the network with movies and stuff like that, and hopefully it doesn't lose its s*** before I can afford a more secure configuration with redundancy and such, but it's held out just fine for over a year, so I've got my hopes up.
4739773
This antenna isn't going to provide great range or performance, but it works OK in situations where you can't easily hard wire a CB antenna.  I installed it on my travel trailer window, to avoid drilling a hole in the roof or exterior wall. Works fine for short range CB communications in the campground, which is all I wanted to begin with.
1202777
I've needed something to keep the moisture out of the gun safe for a long time.  This works fine.  I guess high end types of dehumidifiers might sense humidity level and shut off when not needed, but this works fine for the price.  I'd rate it higher (for the price) except that the a/c plug that comes with it for the user to install did not contact the wires.  It is not on the cord when it comes, as shown, so the cord can be fed through a small hole drilled through the safe's wall or floor).  The plug is an IDC (insulation displacement connector) style and the prongs that are meant to cut through the insulation to contact the wires, when assembled as directed, did not contact the wires.  Being no fan of "IDC's", I threw it out and properly connected a two-wire, 14 gauge appliance replacement cord.  I needed the extra length, anyway.  I would seriously recommend scrapping the plug assembly provided and have some one who knows what they are doing install a decent plug with appropriate insulation, shrink tubing, etc...