I have the Garmin 305. It took me a year to figure out how to use it with some proficiency, but now I'm in looooooovvvvve.
It is very techie, with a novel for a manual, but check this out...
http://trail.motionbased.com/trail/user/h2odiva
This is the data you can get from the garmin about your workouts. Waaayyyy cooooolll.
Living life like there's no tomorrow.
http://gorgebikefitter.com/
2007 Look Dura Ace
2010 Custom Tonic cross with discs, SRAM
2012 Moots YBB 2 x 10 Shimano XTR
2014 Soma B-Side SS