UPDATE: I found a better
mouse trap bike mount. Read my post on how I configured a RAM mount for my Colorado.
Now that my move is over and the baby is a little older, I'm getting back out on the bike and putting my Garmin Colorado 300 to the test. I really like the Colorado, but at this point I can't recommend it for mountain bikers, due to the backcountry navigation issues I posted earlier this week, along with problems finding a decent mount.
Garmin Colorado bike mount
There's really no need to beat around the bush here. For mountain bikers, Garmin's Colorado bike mount sucks. It's held on by two zip ties. I kid you not. The result is that after a few good bounces, the unit slides around as pictured below. Despite repeated attempts, I haven't been able to get it tight enough to avoid this. I haven't tried it on pavement, but at least one commenter likes the Colorado mount on his road bike.
It looks like RAM has a mount coming out around the end of this month, but I'm not sure about the handlebar mounting system yet. I certainly don't want this monstrosity. I think that their standard rail mount will work, unless you've got a bike with 31.8 mm handlebars. Anyway, I'll try out that combo once it's available and will report back.