Mine arrived DOA upon purchasing new. I sent it back to LabRadar and they let me know that the sensor that triggers velocity readings were bad. They corrected the issue and sent back to me within a week. It hasn't missed a beat since that day. For me, it was well-worth the money to use at a range with others whereby I didn't have to hold up the line to setup a chrono.
It does have its limits....Won't read over 4K fps and has trouble with smaller calibers (< .22).
