Full disclosure, I work at Garmin.
The usability really needs work. The thing bellies up to the bar and just chews through batteries. On a motorcycle trip to Alaska I would have thrown the thing in a river had it not been for the fact that the fish don't need any more heavy metals to swim. For about the half-dozenth time that trip I missed nice video because it's impossible to know what state the camera is in without getting off the bike and looking at it. Sure, there's a light on the front of the camera, which is great when your subject wants to know that it's recording. However, the mountain goats were not very good at letting me know whether or not it was recording.
Most of all, there are no outstanding features that would make me buy a GoPro other than it's popular. Which is why I don't buy their stock (though I set a price alert, and then forgot to short it). As already pointed out elsewhere, there are other cameras that are probably equally good for considerably less money. I'll keep the one I got, it mostly does what I bought it for. But I'd never buy another one, nor recommend it to others.
Anyway, it looks like I kind of hijacked your reply; sorry. I'll reiterate: I wish I had purchased your company's product instead. :-)