I just got the Garmin 305 and hooked it up. What a cool toy! But, DH and I "share" it. That is, it sits on my bike, but we both have the software installed and both play with the results. Of course, that means he can tease me about my heart rate and/or cadence, but we both get to play with the profiles and the grades.

So far, the coolest has been playing with the % Grade. Sure we live in the flat lands of the country, but the %Grade helps show which hills are really harder (by grade and also by recovery flatter spots). But, more importantly, we have one place on our route where we both bonk out. It looks like a flat, twisty-turny road, but with the GPS we discovered that there are several short bumps of 4-5%. We still feel it, but now we can see it is there.

Go ahead...do it...you can hear it calling you, can't you?!??!?!?