Back when I was playing paintball a little more seriously, one of the best tools I had to improve my game was my trusty Replay Mini. I loved it, until I watched the footage and saw how many silly mistakes I made. They really are great tools though, being able to look back it actual in-game situations and see your mistakes is just amazing. Think of the way the NFL players go back after games or practice and watch film, they learn for their mistakes and correct them.
If you want to get better get a replay!
Below are a few videos that Greg from How To Play Paintball with his Replay.