I have taken part in one Kickstarter project, and that was for the Fosi V3 class D Monoblocks....of which I ordered 3. The project was for various combinations of V3 monoblocks with either 5A or 10A external linear power supplies.... all at 25% to 30% of retail price when released.
The project was over subscribed many times over, and there were some headaches with expectations about arrival which have all worked out fine. I just received mine yesterday along with a "surprise" addition of a couple of high quality op-amps to roll. I will not have a chance to hook them up for some time, but the early reviews (users and professional) have been exciting so far. Based on that, I would use a Kickstarter project again.....but would be on a case by case basis