Discipline and focus is the key to competition shooting. Ever notice how some shooters clam up/screw up when others are watching during a timed match. I shoot with a buddy who shoots IDPA with me. We watch one another's stance, reloads and movements. Sometimes we use a shot timer. We've also used a camera and watched the play-back in slow motion. THAT will really reveal the good, bad and ugly of your shooting techniques. So, I prefer to shoot with another…another set of eyes can only be good. Having said that, if you discover you and your shooting buddy begin to start screwing around just throwing lead down range, then try going alone. Just my opinion.