Originally Posted by
mzeffex
MSRP is higher - and the 500 is supposed to improve what was wrong with the 305. Why pay more for less?
You can snag a 305 for dirt cheap if you look around and buy used.
The 305 does have an issue with the battery connection but if you're hand you can fix it (so can garmin, and they do). The 305 offers workouts, the 500 doesn't (yet).