Just another "me too" here. I've received my pro1x a few days ago, i haven't tried cellular (and don't plan to), only using it on Wi-Fi, but it is really awful. Sitting 2 meters away from the access point in the same room, direct line of sight, it fails to maintain a Wi-Fi connection; it frequently disconnects. Speeds are less than 10 mbit at that distance, when it can connect at all. Even a simple ssh session to another computer on my local network lags, stalls, and disconnects to the point of being unusable. đ
(I have never disassembled it and there's nothing rattling.)