One problem with the Xcortech's is that I find it's not always calibrated properly and can be up to 15 FPS off what the actual speed of the BB is. I don't know if you can calibrate it though.
I know for example that one of the local clubs chronos is about 10 FPS off what the actual speed your gun is firing (reads me at 403 FPS when I know for a fact that it shoots at about 394).
Also as far as the Madbulls go, for some reason their readings *can* get a bit wonky I believe people have said it relates to having low battery in the unit.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE