Steve,
I have 2 Val 760's in my 6. One I purchased new the other was used.
I have never had a problem with either one. (In service for 9 years) I have had complments from towers and other airborn aircraft as to the clarity of the transmitions.
I have had a chance to try the new Com-2000 radio and the new channel switching knob, rather than the toggel switch and I find it is much faster and easier to use. If you have any questions, call Chuck at Val Avionics (800)255-1511
Hope this helps.
Rich
RV6 721ET