Yes I use the Garmin Oregon 550 on my mountain bike and also used it on my road bike.. It is a very nice setup.. If I had to do over again I would buy the Dakota 20 series, just a little smaller verison of the Oregon but bigger than the bike specific Garmin computers like the 305 or 705..

Do not even consider the Dakota 10, it has no memory card slot and is very limited..

here are a couple reviews

http://www.gpsfix.net/gamin-dakota-2...t-impressions/

http://gpstracklog.com/2009/10/garmi...20-review.html