The Sony cam is trash. If you can't rotate the imager, and you can't rotate the mount, then you're kind of screwed. Extremely short-sighted design on Sony's part. Might be useful for other things, but difficult for paintball.
There are multiple things that bother me about the Contour. Depending on the model, the lip around the lens is not easy to field clean (hence why you see so many blurry and smudged Contour videos). Then there are numerous instances of them not surviving a paintball hit, and Contour/Vholdr's contemptuous response towards its customers. And then there are the somewhat disingenuous users who will cite the size of the Contour, but neglect to include the extra housing that you are required to put it in if you want it to survive or expect help from customer service, if ever they decide to support paintballers in the first place.
The Replay Mini actually looks like a pretty good cam. It cuts numerous corners to achieve such a small size, but it definitely does a number of things right. The lens system looks sane, as well as the sealing on the backside. Biggest liability is the fact you can't change out batteries.
"Accuracy by aiming."
Definitely not on the A-Team.