I've had my 520 for a couple of weeks now, and have encountered bug after bug. Strava segments don't sync, heart rate zones give false alerts every 10 seconds, the unit doesn't detect on my computer half the time, etc. etc.
So my question is, should I return it and get the 810? Or should I wait it out and wait for firmware updates?
I can't find a good side-by-side comparison between the two. So far all I can tell is the 520 is Varia compatible, and the 810 has true navigation and a touchscreen. Are there anymore differences?