I definitely have learned to keep an eye on it while shooting at the bench; pretty easy to inadvertently bump it out of position.
So far mine has been drama free at the range. My usage really hasn't tested the limits though (geometry/construction/velocity).
Here's is a pretty good shake-down of bullet size and velocity where three recent players in the chronograph world are compared. Seems like the Garmin pulls ahead when the Labradar and Magnetospeed start to falter.
