My parents put in a central vac when they built their current house about 20 years ago. The thing has never had any major issues and works like a champ. Also like Pio, it sucks very hard (TWSS?) and cleans better than any upright I've ever used--though granted, I've never used a very high end upright. The plugs completely blend in.
The only annoying thing about it is that the hose is very long and heavy, but I imagine they chose that size for a reason.