I just recently got an Edge 520, but I am having some serious sync issues. Everything works fine until I try and send the Strava segments to the device from the transfer queue in Garmin Connect. Once the download starts Garmin Express freezes and crashes my laptop. The device then will not sync via the bluetooth connection (it does connect to the phone, but will not transfer data). I get a "sync failed, server error" message on my phone. Only way I can correct the problem is by logging out of Strava connections in the Garmin connect widget, and forgetting the device in Garmin Express and starting over like it is a new device I am connecting for the first time.
Sure would be nice to have Strava live segments given this was the biggest selling feature for me.
Anyone else having these problems?