it finally came in yesterday, we tried it when she got home from school. this thing is great, the only way i had to check her speed was with a gun and her spin was by watching the ball as i was catching. well i was very pleased with the results. my dd just turned 11 on 2/4 and i clocked her with a gun at a cruise of 47 mph and a high of 49 mph. when we got the RevFire out her cruising speed was 45 mph and 16 rps. i believe this thing to be right more than a gun.