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.
It's an established manufacturer, but they seem to use indiegogo for some reason as a launch platform.
they are in china so maybe that the best way they do it, create a few prototypes and then have the assembly lines to allocate later.
How about something mote established then, like the Pocket CHIP[0]?
Unfortunately I don't have a lot of faith in crowdfunded hardware projects.. :/