I bought an RX-65 from RadarBusters the other day after lots of research on these boards. Upon using it for the first time, it displayed "Service Required" within the first 10 minutes of use. Turning the unit off and then on again led to the same results. I contacted Roy about this, and currently I have a replacement RX65 in the mail. He was a pleasure to do business with, and the whole transaction when extremely smoothly.
-RX-65 quality control is REALLY bad. Seriously consider that extended warranty. Why Bel doesn't increase the price by 10-15% and make the unit more reliable I'll never know.
-Because of point #1, buy from a good vendor like Roy. Beltronics apparently doesn't believe that $300+ units need to be consistently reliable, so make sure your vendor does.