I had a wahoo Bluetooth strap (but not he TICKR -- I can't remember the name, I don't think it had the ANT+). I used it quite a bit with my iphone. I was disappointed in the "history" feature of the Wahoo App (during my workout, it told me how many minutes I was in each zone, but when I'd go back and look at prior workouts, it only told me average and max HR, and calories but no time within each zone). I bought it with a gift certificate in June of 2013, and had to replace the battery twice. The second time in March of 2014 it stopped working entirely. I made a warranty claim since it was less than a year old, but they wouldn't honor it since I hadn't kept my receipt and couldn't prove when I purchased it (although I knew darn well from my workout logs). I liked it when it worked. Hopefully the TICKR is more robust. When mine stopped working, they told me you have to fiddle with a tiny little metal piece when replacing the battery, it gets bent down and is frequently a source of problems. Duh, if its a source of problems come up with a better design.