My ex boss had an Avensis. Shows his age. His wife had an MR2. Make of that what you will.

My wife drives a Citroen C3, unfortunately its just the car that is french

Yet to trey them both but I think they are different beasts (the Muvi and the Vholdr that is) and they should be - there is nearly £150 between them The Muvi pic quality from what I saw seems very good for the price and its so simple to use and very small but the vholdr is more refined, I would (and have) happily stick it itn direct path of mud and water and know it will shake it off because it is all sealed but even with the plastic cover the Muvi apears vunerable (esp the USB port on the bottom which is the only way to charge it so if that gets the smallest bit of grit in it you may as well bin the camera - I would recommend putting some tape or something over it if your taking it on the bike)
They both seem not too good with the mounting options for a bike (with the 'waterproof' case on the Muvi it can only really be used with a velco strap, on the other mounts not sure how secure they would be over sustained bumps - definatey use the neckstrap to secure it to somewhere else on the bike) I know though the Vholdr has some good new mounts being released for handlebars, conventional camera style mounts etc, which at the moment is the real problem with it as the two standard mounts available are both crap
Unless you are really good, into all your video production and filming and editing some genuinly interesting stuff (and there is some great action sports stuff on the vholdr website - skydiving etc) rather than just 'the descent down this slightly rocky hill on a sunday morning with a few of my mates' I would definately say the Muvi wins hands down because of its incredible value and the fact the pic quality is perfectly good enough for Youtube and stuff and it is so easy to just throw in your pocket
So ...... anyone want to buy a slightly second hand VHoldr Helmet Cam (or a slightly dented Hyundai)?