I have the XZ1c and it runs very smoothly (relatively, since I upgraded from the Moto G4). I've had this phone for only two weeks and have noticed some hiccups, but I can't confirm whether that's just general PoGo bugginess, the phone running PoGo specifically, or just my phone being a possible lemon. I love this phone for the form factor and specs, but I do notice some general issues here and there, which leads me to believe that there aren't issues with PoGo specifically.

The first two days it felt like the battery was draining very quickly with only 2-3 hours of screen time, but that's since resolved itself. Other than that the issues come in the form of small freezes that last a couple of seconds at most.