I can't say enough about Arccos. I've had my sensors for 2 season. The amount of data provided is incredible. The app has recently been updated and it focused heavily on putting. Arccos is in this for the long haul as evidenced by the amount of OEMs putting them in grips. The more data collect, the better the app becomes.
Arccos has helped me tremendously. I recommend to all my friends/playing partners.