That's always the danger. I've backed about a dozen projects, most successfully, two failed. I've learned to look for the red flags.
I think these guys are mostly on solid ground. They have a demonstration video. Their $100,000 goal is realistic. The only thing I'd be concerned with is their shipping plan, which is April/May 2017. They will probably miss that ship date, because mass production and shipping logistics are always underestimated. I think they need to tag another 3 to 6 months on that to be safe.
But, yeah. I'd probably pitch in if I thought I could use it. I think large CNC beds won't benefit from 4-corner leveling as much as tiny beds on 3D printers. It's easy to measure CNC bed inconsistencies with a digital indicator, or even just a length of bent coat hanger wire.