Marsha,
We've had Vacuflush toilets on boats for many years, and every boat in our club has Vacuflush toilets, including the one you, Tim and Charlie rode in. In our case, we have two bathrooms, and both 'heads' have their own Vacuflush system that pump to a common holding tank near the stern of the boat. These are not macerator pumps, although I often see/hear them incorrectly called that. Typically, they're a simple diaphragm pump in conjunction with a vacuum tank/accumulator, and a couple of duckbill valves at both the entry and exit..
I can't say they're trouble free, but we've had far more problems with toilets at home than on boats. They do rely on vacuum to "suck" everything down the tube to the pump, and leaks can prevent them working efficiently. But the main cause of leaks is around the seal in the commode, usually caused by a little piece of TP preventing it from fully closing and sealing. Easy fix.
Bottom line is that I wouldn't walk away from a coach that I like because of vacuum toilets.