After countless problems with syncing and notifications with my Band 2 and Garmin F3HR on my Icon, I finally decided to try something different. I had been on the fast ring for quite some time, but I nuked it back to 8.1 and then updated to W10 through the 'official' Verizon channels. Its early days, but at the moment everything is working! Sync, notifications, even the live tiles for MS Health, Outlook, Calendar, which hadn't worked in ages. Everything appears to be working with the Garmin as well. We'll see how long or if it lasts.