I'm on my second video camera. For the longest time, I the VIO POV 1.5 unit (720 resolution)
, which is by far the most rugged, and versatile unit, not only because it's waterproof, but because the recording unit is very functional. I've wanted to the HD version, but it's pricey. What's nice about it is that the recording unit is in continuous recording mode and with the remote unit, you TAG your desired moments. Example: You just drove pass something that's very cool. TAG. The tag is place at up to 3 minutes before the tag. On your computer, you then can download just the tagged clips since downloading hours of video would be a waste. Secondly, the camera unit is located on a lipstick head unit attached to a 1 meter cable to the recording head and half way up the cable is a microphone, such that you can put the head unit on your helmet, and the mike inside as you narrate your footage. What I like to do is to put the bike out of the wind field.
Almost all of these action cameras have one major fault and that is that their mic's pick up a horrible wind blast, making the audio annoying. The mike on the VIO POV can be placed outside the wind blast field.
Here is a sample of the audio and video. Again, this is not an HD unit, which now sells for $599.
And up to now, I haven't wanted to buy GoPro because of the mike limitations. This was resolved in the most recent introduction of the GoPro HD Hero2. Same price, 2X improved lens and - the best part, a plug for an external mic. I've been waiting for this for the longest time. They've improved the user interface a great deal using natural English, instead of gibberish in the previous GoPro HD. You must insist in the Hero 2 if you want the newest feature set. Other new and improved features are a 11MP camera (compared to 5MP). It can take high speed stills (10 per second burst mode) and time lapse photography. All of this is shown in this clip
The newest GoPro for Motorcycles sells for $299.