A couple of days ago we had a match where we decided to use the IPhone Slow Motion Application to determine bad hits. The two players agreed and it worked fine except it took a while to become proficient at the replay. Some replays took up to 2-3 minutes due to determining the correct replay speed and finding the location in the memory of the shoot. The other problem was beginning the taping then waiting for the player to get into his stance and stroke the ball then shoot. Has anyone else tried this out? It might be a good tool for tournament play. What do you think?