I've used them both. Magneto speed is on my Christmas list.
If you shot suppressed and the guy next to you was shooting an unsuppressed 338 Lapua would it even work?Actually it is. Once you get it positioned, it's basically setup for testing a particular rifle or pistol. You'll remember where you position the unit when you use the firearm the next time. It's similar to the Magneto since you need to remember which fitting is used for a particular rifle. You also don't always need to adjust the position when switching from one rifle to another rifle. You also don't change the Sensitivity each time either. I leave mine at Level 2. With that said, I may need to move up to Level 3 at some point if a guy decides to sit next to me with .338 Lapua. With Sensitivity, as you go up on the scale, it reduces the triggering range so the unit isn't activated by another person's shots.
I have read where some people complain it's hard to aim the unit. I've not had a problem, but I followed suggestions for taping a cut down straw on top of the unit where the sight is located. I guess that is needed since the Labradar's radar beam is narrowly focused and needs to be aimed at the target.