I've just got (two weeks ago) a Muvi HD 10. I'd had one of the old teeny Muvis in the past, and liked the really wide angle lens, and its performance in the dark (both compared to the ActionCam 2K I had before that) - so when the old Muvi finally died (after being dropped in the road one too many times, and being leant to a courier for a couple of weeks), and my mum asked me what I'd like for my birthday...
Quite impressed so far. Reasonably big rectangular unit (kinda mobile phone sized but a bit thicker), so a bit more obtrusive than the likes of the Contour. The wide angle is lovely, though one thing they don't mention (but which I had seen in a couple of reviews) is that the 160 odd degrees coverage is only if filming in 720p and below - if you film in full 1080p then the angle is quite a bit narrower.
It's an interesting pay-off. I like filming in the wide angle to get everything beside me covered, but the slight fisheye makes everything seem further away, so reasonably close passes don't look as dramatic...
Anyway, it comes with mounts galore. Clips and velcro and elasticated bands and wee swingarmy things to attach to any of them. It's really easy to shift between mounts. I'm not sure about the bike handlebar mount (which you have to buy separately) as it shakes a bit too much (I added my own padding to it to dampen this). But it comes with a helmet mount if you wear one.
I tend to use the big strong clip, and attach to the strap of whichever bag I have (since I carry a camera everywhere) up at my shoulder. This keeps the angle pointed up so when I'm down on the bars it's at the right angle. It cuts down a bit on 'shuddering', although maybe 'swings' more as my body moves (especially when out of the saddle). Chest mounted is funny as the wide angle shows all of the bars and my arms coming down either side.
I'll post videos once something interesting enough happens to put up on YouTube!