yes,
All my equipment has user locks.
APX, BK, XPR7550, XTS2500, XTS5000. Its an added safety feature. Someone steals my radio and they turn it on it needs to be unlocked to work.
I made a cop pretty mad once when he asked to see my radio. Handed it to him, he turned it on and asked me for the pass code. I said sorry sir your not authorized to use my radio. Went back and forth a bit and he tried to play FCC cop but i simply said Ok and waited for him to hand me my radio back and went about my business.
With a radio that can transmit its a key feature in my opinion. But with a device that is RX only while it would be neat to have its less important.