It's funny cos I assume build quality is a major factor but then it seems like almost everyone is assembling them themselves. But yeah, quality of materials of course.
At the moment I'm hovering on the Revo HHKB but I feel a bit like I should probably just try an actual HHKB. And if there's a Rama HHKB alu case coming out later this year, which there seems to be, then I'd probably be more into that. I dunno, I guess aluminium HHKB style cases come along fairly frequently. I've got a KBD75 and an AMJ40 on the way and am hoping to get on the Lightsaver and SKOG GBs so probably have plenty to be getting on with...