Sometimes it is fussy about pairing, but once it starts working, it's great. I posted screen captures from it here a while ago. The graphical analysis was very good and the female voice that announces the shot velocities is great if you have shielded the unit from ballistic damage.
Here was the post with some of the screens: http://www.network54.com/Forum/79537/thread/1458097064/ProChrono+Digital+Link+Bluetooth+app+success
Unfortuantely I left the whole rig out in the rain, and now I have issues. It still reads individual shots but the bluetooth is dysfunctional, etc. Competition has a very fair repair policy (no way would I claim this as warranty), and I am going to box it up and send it in for service. I talked to a tech there, and they have a very reasonable cap on the max cost of service, well below the cost of a replacement unit. That made me feel even better about this choice of chronographs.