Excellent
The new version is awesome and works seamlessly for me. I have been using the app for several months to monitor heart rate for health issues. It really extendeds the functionality of the watch for this purpose. I havent been able to find anything better than this app for my needs I use it to monitor HR, activity and workouts. I also track sleep. If you forget to activate the sleep function you can manually enter sleep in the apple health app and it will analyze it for you based on your entry. This is a very function rich app.
Tashi689 about
HeartWatch: Heart Rate Tracker, v3.0