I bought one from Sweetwater, used it for one talking head gig, and returned it. The main reason for returning is that I learned that Bluetooth connectivity is not as immediate nor as stable as the WiFi control that we have all become used to for our digital mixers. I was in a 100' x 100' convention space and, when I walked to the edge of the audience area to check on how the volume was at that location, I walked out of the range of the mixer. This isn't really a flaw in the mixer, rather it was more like me learning that my requirements were beyond the capabilities of Bluetooth remote control. There was also a lag in the response when making a change via Bluetooth.
Regarding the faders, the mixer has 60mm faders and I had some trouble making fine adjustments with them. A little fader movement got me more change than I wanted. The mixer is compact and does have good Eq and Compression via the app, which is what attracted me to it in the first place. But ultimately, for my use cases, I think I'd be better served with something like an MR18 and a WiFi rig.
Bluetooth has a specified range of around 4-5 meters (the "high power" BT flavor is maybe 10-15 meters but that's not what Behringer used). Within that distance I've experienced none of the issues you've had. I also have not found the 60mm faders to be any less precise than other 60mm faders. Perhaps there was additional interference in your location.