What does this mean, about the 500? I agree about the GSC. (I got a pedal-based power meter which reports cadence, so I gave mine away, couldn't be happier. My bike goes in the car a lot.)

I have an 800. A year and a half ago I bought a Garmin watch, which I use on the bike. It stays on my wrist when I ride and the 800 is still on my stem, giving some basic info. But the watch is what uploads the ride, it captures a lot more data which is important to me, it gives me turn-by-turn directions on FS roads, etc. It also tells me what time it is when I wake up in the middle of the night, and tracks my runs and hikes, so it was a natural, great fit for my needs. If your 500 still works, that might be an option worth exploring. There are a lot of cool watches from many vendors these days.