I have a Magnetospeed V2 and a Labradar. I have had no problems with either. I prefer the Labradar because I can set it up while load testing or or just practicing and get velocity readings on every shot. The only problems I've had with it were user error. (forgetting to arm it, accidentally bumping so it's not aiming at the target) and once when someone else was using one a couple spots over neither one was picking up the shots like it should, we changed the channel on mine and both worked perfectly after that. I've used it at times when there were shooters on both sides of me and it never picked up their shots. I've recorded as many as 65 shots in one session and it never missed one.