Superficially it looks pretty good, but there are some details I didn't find handy. For $400 I expect to be able to switch roms and batteries, and for the storage to be decent (not sure what kinda storage they run).

If it tests out to be durable enough for 4 years it might be worth the $400, but that's a gamble for those who just have to have a keyboard and don't care about much else.

For comparison, the other device linked here (Comet) is $250ish and has some swappable parts, including gaming controls. And I think that's overpriced too. Considering neither are tested and known quality tools.