I checked out Gaming Lagoon after hearing great things about it here and elsewhere. Initially, I wasn't too keen on filling out surveys, but I stuck with it and quickly amassed the points I needed for the prize I wanted (an Xbox 360 memory unit). My prize was processed promptly. Unfortunately, there was a foul-up with its shipment, but Gaming Lagoon made things right. They quickly responded to my prize inquiry and immediately processed a replacement, which I received within a week.
I'll admit to be very skeptical at first, especially when the delivery of my initial prize was botched, but it all worked out in the end. If you want some free gaming stuff, I highly recommend giving Gaming Lagoon a try. Just make sure to have a little patience, and use some common courtesy when contacting them or posting on their message boards. It'll make things go much smoother.