I backed this one as well. I was unsure at first, particularly because of what happened with their Rapide One campaign, but the overwhelming number of photos and updates curbed my doubt fairly quickly. I still went with the "commit now pay later" option as a further measure to protect my money, so I'll have to wait a while longer for mine.
Rapide-3D is a company that already had some start-up capital, so the Rapide-Lite was way beyond the rendering and prototype stage when the campaign started. They were ready for a small production run from the beginning and set up the campaign as a way to test their manufacturing process (which is almost entirely internal), square up their shipping methods, and generate good-faith with a base of users by delivering their product at cost.
I'm happy to see the reports of people receiving their printers. This has been an example of an IGG campaign done superbly. It's quite uncommon to see a campaign deliver exactly what it promises so near to the timeline expected (they're just a couple of weeks behind for the early bird adopters). Also unusual is the frequency of their updates; their updates have occurred so regularly that some backers have complained that their email is being spammed (updates occur almost daily!). I don't think I have ever heard of anyone complain about too much information on any other crowd-funded campaign. For this, they really deserve credit where it's due.