I have the GRE equivalent, PSR-300 and love it. I've used it in the L.A. area with no problems (sheriff, fire, CHP). It is not digital, so it only receives analog but that's quite a bit.
The Pro 164 looks just like the Pro 97. The only difference that I can see is that it's been rebanded on 800 mhz. and receives the new TRS networks untilizing frequencies below 855 mhz...