We bought the R1 HD for our son for Pokemon Go. The lack of gyroscope for the games AR support was minor, but that's just an unneeded battery drain, imo, so wasn't an issue.
Being said, our review of the phone is fairly positive. Battery lasts about as well as my wife's Galaxy S6 Edge+. The ads are easy to ignore. The WiFi range does seem a tad lower than the range on my phone, the Galaxy S6 active, but not sure that's enough to complain about given the price of the phone.
Biggest complaint, which comes from use of the phone with PGo, the GPS signal does seem to go in and out and sometimes the app has to be re-started. That could be the app and not the phone, but since he and my wife are playing simultaneously and her phone isn't have the issue, we want to blame the phone. Only a few hour long excursion, it'll go out maybe once, twice at most.
Beyond that, as far as video, camera, and app support, it has ran fine. No real slowness or anything. The lack of the quiet time feature is a small bother, but since it can be automatically powered down and up at a certain time, that works just as well, if not better since it's for a youngster.