So I've had my UB2 now for a few weeks, and I deliberately tried to push its limits, so I then know its limits and now work within its limits.
The fundamental problem is battery life, if you use it tethered to the phone, in BT distance mostly or the odd fallback to Wifi, then battery is good, I see a slow drain say 2%/hour for just notification filtering. If you try to use the UB2 AW2 capability to be a truly standalone mini-phone on your wrist, then battery life stinks, I was get 25%/hour. I played with the likes of the onscreen keyboard, the Play Store, but there were very few apps built for AW2, even the claimed Uber app had disappeared. Using it as a phone for talking, about 50%/hour battery drain and in my case it
overheated and hung up the call!
The FAQ and the "support" from Google is terrible, you see they basically suggest resetting the watch as an answer to a
problem and there are plenty of users
complaining and its not even rolled out to that
many yet.
The Apple Watch and the Samsung Gear S3 proves you get a decent product, just Google hasn't yet.
I've owned AW now for over 2 years, I have the Sony SmartWatch 3, it was doing good when I got it, then they did updates which enabled Wifi and it was really buggy battery draining for a couple of updates, now it is very good. So I'm thinking let the masses be suffered by AW2 and version 2.02 (whatever it is called) is the time to jump.
I bought my UB2 because its going to get AW2 and its only $180 or so, and so half the price of the LG Watch Sport which on paper looks extremely similar specs to the UB2.