Some people have been saying that they haven't received their rewards, I've backed 9 projects, (one still in progress, but the elevation dock is going to get funded), so far I have received 2 of the 9 rewards I had selected. 5 of the projects have posted updates regarding manufacturing and that they are still on track regarding getting me the reward as promised.
Only 1 project so far has me worried that I won't see my money back. Either way, to me it is a gamble. Either I just gambled my money away and get nothing in return or I get something before anyone else in the world is able to purchase it.