Bests & Worsts Reviews from Amazon

Once I managed to hack my way into the package (I hate those plastic packages that everything comes in now) I had it synced up and working with Strava on a iPhone 4s in just a few seconds. Also worked fine with Endomondo app. Used it while cycling with iPhone in back jersey pocket - not problem staying connected and supplying the app with heart rate info during the ride. The battery life of the iPhone wasnt impacted - I get about 4hrs while using a GPS tracking app. I've got about 150 miles in with this strap - no issues with connectivity, battery life or comfort. The strap connector is a small metal hook that fastens into an elastic loop. I haven't had any issue with it, but in general its not as nice as some other straps that I have used that had a more robust belt-like plastic buckle. The native support, no dongle or anything else to plug into the phone, makes this really nice. UPDATE: Bluetooth connection remains after you are done with your work-out. After stopping the recording of Strava or Endomondo, the Bluetooth connection remains b/t your phone (iPhone 4s in my case) and the HRM. I burned one battery before I figured out what was going on. When I'm done now I try to remember to actually kill the app. UPDATE2: I have had a lot of trouble getting this thing to sync with my iPhones. I ran across a review that said you need to wear it for a few minutes without the battery in it to fully reset it. That worked wonders. I also think that when its really sweaty/wet after a workout its worth unclipping it to get the unit to shut off sooner and save the batter