Got one of those small cameras off ebay, think I paid about £25-£30 for it a few months ago. Put a better SD card in it a 8GB class 4 (or something like that).
The quality is ok, but as you can imagine for the price not the best, the sound was better on the original copy but I have made it half the size to upload it. Think most of the problem are caused with the mounting point as its on the front forks and gets alot of vibration, need to find a better place to mount it.
Just to clarify the camera was testing on an unknow riders bike on an unknow road etc etc
http://www.youtube.com/watch?v=MJxDOLw2tPQ