They were good units and are single-antenna systems. The main problem with VHF is that it's nearly impossible to keep track of all sources of low power interference that might be on that frequency. These were mostly single frequency systems too.
You might be at one location in your city and the maintenance guy has a walkie-talkie on your frequency. That wouldn't cause you a problem across town like a powerful UHF TV station will, but it's much easier to document and avoid TV stations than the many sources of VHF traffic sprinkled about.