Did you update the firmware? Apparently they improved the controller compatibility. I'm waiting on an SD card to show up to try it, though. It keeps disconnecting from my SNES joyconIt won't sync to any of my PS4 controllers and the first time I plugged it in it rebooted my whole TV setup and I had to unplug the Raspberry Pi so it would stop getting caught in boot errors. Also it deleted my Dragon Quest saves. ¯\_(ツ)_/¯
I'll report back when I get an 8bitdo controller and get to properly test it, but so far the Pocket has been a bit of a disappointment if I'm being honest.
I bought an 8bitdo controller a few months ago but kind of hated it and returned it. I'll be miffed if those are the only controllers that work.
I'm loving the device itself, though. The pixel filter is something else.