Boox is dodgy, but everyone I know that has one loves them. I wouldn't expect any Chinese company to respect GPLs. Although, I've seen people on Reddit say they can have QA issues, and if you receive that unit you're likely SOL, this is the only reason that I've been hesitant to spend money on one. I've also been eyeing this new company, daylight, that has a 60hz refresh rate with what I think is E-Ink[0]. Their website says E-Paper, not sure if that's different from E-Ink. Unfortunately, they've always been on wait list months out every time I've looked.