I have in the past owned two Polar watch heart monitors, and I was in the process of buying a more updated version when I stumbled on this, and realised that I could use my iPhone with this heart rate receiver. I am totally impressed with the amount of available apps that are able to work with this product - I currently use the Runtastic apps which upload information to MyFitnessPal which I use to monitor both my exercise regime and my calorie intake. This to me is much better than using the watch as the app is able to give far more comprehensive information. I use it for any type of exercise, cycling, walking as well my DVD workouts and when I am working out using my gym ball, stretches etc.
I am able to monitor different phases of my heart rate at rest, during exertion as well as post exertion, with ease.
This is a brilliant improvement on the watch heart rate monitors and have definitely it a five for performance thus far.
My only gripe is that the band itself could be more secure and if I could give stars on this it would be a four, however, this said and as mentioned above the performance of the monitor gets five stars, as it very functional in my health and fitness regime.