I have to say that I'm very disappointed in the amount of time this thing actually worked. Although I've had the strap (paired with my Edge 520) for several years I've probably only used it 20-30 times. It started to drop-out on my last ride so I thought it was the battery, but a new battery does not help. I've tried disconnecting and reconnecting several times and nothing seems to work.
It's really a shame that after only using it for 20-30 times I have to go and purchase a new one. I have to say that it appears that along with the problems and quirks I'm having with this and my 520 it seems like Garmin is really testing my patience.