I got the this camera a few weeks ago and I am SO glad I did. I have had NO problems with it whatsoever. It is extremely durable, completely waterproof, and the video quality is fantastic.
Battery: I charged the camera ONCE when I got it and it lasted well over a week of playing around with. On a full charge, I was able to use it for an ENTIRE day of snowboarding and it barely used half of the battery.
Lens: Yes, it does fisheye a bit due to the wide angle lens, but I personally like the look and it makes so much more visible to the frame.
Mounts: Stuck one to a snowboard, one to my helmet and they haven't budged. The bolt it is tightened with just has to tight or the camera can rotate up or down. The suction mount is extremely strong and I bet it would hold at 100 mph.
SD Card: I have a SanDisk 16 GB Class 6, and it works great. For some reason, the camera doesn't show up as a drive when plugged into the computer via USB, but I use a card reader so it hasn't been a problem.
Navigation: This is about the only thing I could complain about. The waterproof case gives the buttons a bit more resistance, and as far as the unit itself, it navigates somewhat slowly (about 1.5 second response time after each button press). There are a ton of settings and options, though.
Resolutions: The only ones I have used are 720x1280p at 60 fps, which is LIQUID smooth, and 1920x1080p, which looks beautiful (the more lighting there is, the better. On a sunny day, the footage is GORGEOUS. However, is low light situations, you can encounter grain, so be sure there is ample lighting to ensure high quality.
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