I was a little concerned when I first saw the mounting system for the Garmin 800, however after a month of use it works fine. The bands are strong and with two holding the GPS in place I think I will notice of one breaks. I stretched a band pretty hard and it would not break.
Very easy to get the mount onto the bike, very easy to twist the unit onto the mount. The problem the idiots at Garmin did not address is that the buttons are on the sides so when you push the button you tend to twist the whole thing out of the mount. They need top-mounted buttons or a differnent bike mount.