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One other difference that I didn't know about was Trek's Ion light that connect to your computer won't be controllable with a 520, Evidently, they only designed them to work with the touch screen computers.
I have had a 500, then a 510, and now a 520. Of the 3, I like the 520 best. Picks up satellites VERY fast. The buttons work better than a touch screen. Picks up both power meters, all 3 HR straps, and anything else you can think of without having to program what bike they belong to.
Unlike some, I've never had problems with the software.
So... if you don't need mapping, get the 520
M
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