It sounds like what I have been looking for- to get my Polar HRM watch+mount, trip computer and my Etrex Vista+Ram mount off of my MTB and replace them all with the 800. That I can quickly move it to my road bike means I can remove the HRM mount and computer from it too. I'm running out of handlebar real estate now that I sometimes mount my GoPro HD to the MTB bars so it looks like it will leave me some room for my hands!
Having a GPS on the handlebars gives me the ability to take off on bike trips and not get lost in the mountains in a state I have never cycled before. Went to Bend last year and again this year, and always knew where I was and where the trail went, and how to get back to the hotel or car. Went to Grand Junction CO and Boise ID last month and just took off and never got lost.
You will love the freedom it provides, but what I've read so far is that the base maps are rather thin. I have the full Streets software from Garmin and their TOPO already so when I get mine I am going to load the detailed maps. If you plan to use it off-road or in unfamiliar territory, I would suggest them.
Tzvia- rollin' slow...
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