My 9500ix has saved me numerous times. As AMPowerJ mentioned, a lot of cops don't have their radars turned on, so that may be why yours isn't going off.
Also, you may want to check how your radar is mounted. If it's tilted wrong, that may be another reason why you're not getting radar hits.
I chose the 9500ix because I knew it didn't go off as much as the V1.