I have the same misgivings with crowdfunding hardware, but I ended up backing this project. The same group has shipped two other similar portables in the past, and have some working prototypes. Seems like they know what they're doing.

Edit: I think a big part of it is that they've had prototypes since the campaign launched, but filled the promo page with mostly renders for some reason. If you look at the Updates section, you can see some photos and videos of it in action.