Not sure about the Contour + but the roam is waterproof to 1m without the fishbowl case you have to use with the gopro. Plus I'm just not down with the teletubby look.
I got my roam a week ago will get some vids up soon. I'm learning that there's more to it than it looks, mount stability is critical, and a lot of POV stuff is just plain boring (even when I'm doing 80 km/h and passing everybody in sight). I'm trying a few different mounting locations that I haven't seen on videos yet and we'll see how they turn out. For me it's something I think I'll have fun with this year, and use it kayaking a bit this summer, then probably sell it.