My Labradar also always record velocities in the mid-3000fps range every time.
I have had both, and kept my Labradar. It is definitely more expensive but way way way easier to use, especially on multiple guns and multiple users. Literally turn it on and it's working. The Magnetospeed is very user friendly user interface and recording, once you get it set up on the barrel, but to switch it between guns is a real pain, and I also thought it might have been shifting my poi too.
If you only have one rifle to test, or lots of free time to fuss around at the range, then there is nothing wrong with the Magnetospeed, but for all other situations, I'll take my Labradar every time.