I’ve been wanting one, buy holy crap, they’re expensive.
I got mine (version 1) early in the crowdfunding stage after wanting something to read PDF and technical papers aside from my working screen for a very long time. It’s really helpful, limited to productivity features (no-distraction design and low battery drainage) and kind of usable with Linux (they got a buggy cloud sync app using Qt, in old/abandoned beta state workable on Linux, and a direct web UI usable from some 127.x.x.x local IP provided you have the right USB-gadget driver, which Debian had but not Fedora).
Bottom line, I paid it with the “early bird” discount, but I would not buy it again at current price tag. The v2 seems to improve hardware, now I only fear they might discontinue software support for v1 some time.