Works well - after one dud exchanged
341495
I bought a whole ecosystem of Unifi kit (3 APs, a switch US-8-60W, a CloudKey, and this USG.  I'm not impressed. This USG has an external power supply, and it runs so hot that it's a fire hazard. It's also too slow to handle the advertised functions on my 1gig ISP. It adds over 10ms of additional latency, and its own throughput and latency measures are wildly inaccurate. It is fussy to set up. I'll stick with the router I have, this one's going back. Along with most or possibly all of the rest of the kit.

Ubiquiti could have done better by producing a single integrated Unifi device with a PoE switch, USG and CloudKey, with built-in power supply, all in one device. Instead these are sold as 3 devices, 2 of which have their own external finicky power brick and tiny cable, with heat dissipation problems (hence lower life span), each of which needs to be separately discovered and managed every time one changes network topology.

I did extensive testing on the access points (UAP-AC-M-PRO). They're physically huge, over 12". Their main virtue is better antenna gain (8 dBi, vs 4 dBi for TPlink EAP245 kit they're replacing).  But they have weaker radios (22 dBm vs 27 dBm for the TPlink EAP245).  As a result my net throughput for AC connections is lower.  Why weaken the radios when you have such a sensitive receiving antenna for speaking to faraway clients?
 Maybe they do this to sell extra APs in a mesh system.  I doubt I'll keep them.  Too much fuss to manage those APs separately from the rest of a network, because they need their own clunky management software or CloudKey.

EDIT Feb 2018:
I must have had a bad USG - I tried another one and it doesn't run as hot, is fast enough for my 1g fiber ISP, and does a good job. I returned the UAP-AC-M-PRO access points and bought UAP-AC-IW-PRO access points, and have been very happy with them. Stable, good roaming performance, and good features. Easy to create separate WLANs for guests, IOT devices, and home network. I feel my network is more secure and stable.
606242
Well, when it works, it works well.

However, I have had to return two units when they failed to re-start.  In both instances, the unit worked (no. 1 for two weeks) (no. 2 for about 4 hours) before they conked out.  I will be getting another replacement unit on Monday.  Perhaps the third time will be a charm.
4308501
Looks great but one of them did not work as well as it should -a bit  disappointing
3396928
Works great once you get it working.  When I received it, one light wouldn't work.  The company sent me a replacement bullet that required me to uninstall the lamp, cut and splice wires, etc.  Would have been better if their quality control was better to prevent defective units from being shipped in the first place.
2897979
My first one of these had two ports die within a month or so. The company saw my review on here and sent me a replacement some time after and the replacement works fine. Updating my review here from 1 to 4 stars since 1) they took care of it proactively and 2) the replacement works.
1578302
Update: It must have been a slight bend in the cable or driver glitch, because the adapter has been working perfectly ever since unplugging and replugging it in.

Good adapter. I've had some intermittent issues where the monitor that is connected through this goes black and gets some digital noise before the content is displayed again. I'm not sure if I received a defective unit or if that's just how these work.

On the bright side, it does allow audio pass through, which is nice!
538678
My original one that I purchased had a few problems, but once I got the free replacement, all went well
2303977
First item dead (refurbished).  Return and exchange without incident.  Second one works well.
1073806
Bought two of these and one of them works perfectly, the other sparked when we plugged it in and never worked at all. We were granted a speedy return and refund of the faulty power adapter. The remaining power adapter has worked flawlessly for the month that we have had it and I like it so much I am considering buying another. So I am 4 star conflicted. The one we have that works is a solid 5 star, but the other one never worked, but we got a refund super fast! Solid 4 star experience.
4016071
Watch the polarity - one of them was reversed from the others (my bad luck?)

Put in my old boat (just too many USB type devices these days).  Works great - display is not that bright but its water tight and have not had or seen a problem
1735022
I needed this for an out of country trip but tested it here in the USA before I traveled with it, and I'm glad I did!  After the first charge and use, it bricked itself.  Would no longer charge and no indicator lights would come on.  I left a message with the tech support line and they have not called back.  It's been several weeks.

I ended up buying an Energizer model with dual-USB ports from a local bullseye brick and mortar store on clearance, roughly the same price as the "RAV" unit.  The Energizer worked flawlessly on my trip.
3064126
One didn't work out of the box, rest have worked great for some time now
2982863
Worked for about a month before the power connector became unreliable.  Charges only if I hold the micro USB power plug in a certain position.  Let go and it stops.  We use a rubber band to hold it in place for overnight charging.

Update: The manufacturer proactively offered to replace the defective unit with a new one, which I accepted and which works well.  I'll see how the power connector holds up on this one.  I am bumping this from 1 star to 4 because of the good customer service and that I have a working product again.  If it remains reliable, I'll make it 5 stars because, with the exception of this problem, it has performed well with good battery life and good Bluetooth connectivity.

Update: The replacement product has worked reliably ever since.  Increasing to 5 stars.
1162712
One of them has stopped working after 2 uses but the other works well.
2733989
First compressor was mislabeled but was quickly exchanged and is working well
4190718
So I give it 3 starts. The red one works fine. Bright. Easy to use. Great strap. The white one will not keep a charge. Goes dead immediately. Given that the only diff is the color of the LED, I was just unlucky to get one dud. From the reviews this isn't a common problem. I'm just posting this so the manufacturer makes sure they do the necessary quality control on their products - and that they are aware that there may be some weak spot in the circuitry.
3126489
The first one I ordered was defective, but immediately after contacting support they said they would ship me a new one for free. The second one I've received works perfectly with no problems at all.