I use a Drift HD Ghost. Quality is really good and it's waterproof as standard. One of the features I like, and my GoPro using friends have said they wish their GoPros have, is the tag recording mode. Effectively it is always recording but not putting the video to the SD card. If you then think "ooh, that was worth recording" you hit the button on the remote and it records the last 2 minutes (user configurable) and the next 2 minutes. It saves you recording everything and then going through the footage looking for the good bits. It also has a car DVR mode, whereby it records in a loop when external power is supplied so can be used in accident situations. Unfortunately you can't use that and the tagging mode at the same time.
The remote is excellent. It has a start and stop button - that's it. It has a bright light which flashes to tell you what the camera is doing, so you know instantly if you are recording or not.
The lenses are replaceable and quite cheap so not an issue if it gets a stone chip. You can also rotate the lens so don't have to make sure the camera is mounted exactly vertical or horizontal.
The only drawback is the built in mic is a bit naff, but I've put an external mic in the glove box of the RT and always use that. By putting it in there you get the sound of the engine but no wind roar.
Battery life is about 2.5 hours I think, but I always use mine on external power as it's just easier.
I think there is a new version which has even better battery life, but I don't think it is so much better that I feel the need to upgrade.
Don't know whether this was my incorrect mounting technique or something it will do again. There are youtube videos to help you mount the camera to a helmet correctly - I found those 1 month after my holiday 
