I've been using Gamechanger now for over a year and have documented 2 1/2 seasons with it. I find it very easy to use, and I haven't experienced any stability issues with the program itself. The only problem I've run into is that the iPad tends to overheat during the hot mid-day games and it shuts down. I've used my Android-based phone to keep score as well, but nothing compares to having a giant tablet screen to keep score on. The only other quibble I have with Gamechanger is that you don't have access to the overall stats on the app itself; you have to log into the website, and if you don't have a data plan for your tablet, then you'll have to wait to get home to see the stats. I would also like it better if it was able to track how many innings the players played at any given position, and track their fielding stats by position also. But that's just icing on the cake.