I had a chance to shoot with some friends using the Garmin, it worked quite well, but did pick up shots in other lanes which messed up the average velocities. I still prefer my Magnetospeed, but mine is mounted on picatinny or Arca rails under the forearm, not the barrel. I can shoot as much as I want without it affecting my zero or poi, and it will not register any shot but mine. I'm much happier with it. I do recommend mounting the Magnetospeed off the barrel if you want to shoot groups and record all of your shots.