Interesting. I have the Vivitar blue one, paid $70 a couple years ago, works well, but not the same kind of video quality as you see with the GoPro.
If you put the camera inside the waterproof housing, you lose sound. I like the housing for protection, don't use it in wet conditions, so I have to drill a small hole on top for sound pickup.
For $38, I would use it on my bikes, and if it breaks or gets damaged, not as big of a deal as if it were the $300 kind.
Also, GoPro and another brand just released a new version where you can just allow your laptop to connect and download the pics via WiFi, which is a big convenience.
1995 Honda CB750 - sold
2005 Honda Rebel -sold
1990 Honda PC800 -sold
2007 DL650 - sold
2011 DL650A - current