I've actually been pretty lucky [on Kickstarter (73 projects)], I managed to pull out of a number of projects before the close, and those projects have all failed to deliver. Meanwhile the ones I've stuck with have pretty much all delivered [though usually late]. At this stage I have no reason to believe PCBGRIP won't deliver, even close to being on time.
In IGG it has been a different story, I've backed 3 projects, and only one delivered. [That one was my local hackerspace fundraiser, so I knew it would deliver, and it didn't matter as it was not about the perk] Mu and CryptX2 were the others. Got a refund on Mu, and CryptX2 is dead. I may take the CryptX2 schematics, fix them up, and do the PCB myself, as it's not all that complex of a design.