I had 1 that had a problem. Was supposedly fixed by getting a speed with a radar gun and calibrating it on the app. Never was happy with it. Revfire replaced it with a new ball several weeks ago, but i have not had a chance to try it out as my DD has been taking a few weeks off from softball. Anyone have an opinion on the consistency of the Revfire 2? Will get some info on my new one over the next week or so.