They are excellent radios, provided there is no tampering to the internals. An EMS service I used to work for had a UHF VX4207 as a base station, and had an MDC encoding chip installed. It was in the shop numerous times, and was eventually replaced by our radio shop with a Kenwood TK8180.
As for an unmolested one, we also had VX4204 VHF's in the ambulances, and they work phenomenally.