I don't have a PL-660. I do have a PL-880 and love it. One warning: I had to return the first one I bought - due to one knob being wobbly in turning on its spindle. The second one is fine.
This is a very sensitive and selective receiver. Setting and recalling memory presets is very easy. The controls have a nice feel,and the speaker sound very good for the price and size of the radio. In using the sideband, I do not detect any of the AGC problems others reported in earlier units.