In the past year I've seen a lot of 3D printer campaigns on Kickstarter. Most are reprap derivatives that don't involve any groundbreaking innovation - just refinements to offer more structural stability, or lower price, etc.

I've tried backing a few, but so far the follow-though has been pretty disappointing - lots of broken promises and missed deadlines, and lots of unhappy backers.

Aside from the more famous ones, like Makerbot - has anybody had a positive experience with a 3D printer Kickstarter campaign?