Works great. That toilet uses a unifit adapter, regardless. It comes with a 12", but you can replace it with either the 10 or 14" version as an extra cost replacement. He may be thinking that it is used in addition to the "normal" toilet connection; it IS the normal toilet connection for that series of Toto's. I've got one and a Vespin (which also uses the adapter) and they're fine. Have him look at the thing, and he'll come around. The only thing is that there are holes that need to be drilled to mount the thing. If you've got tile, it takes a little longer. First you set it over the flange, mark the holes for the 4 screws at the back, drill, then screw it to the flange and the 4 holes. Then you set the toilet on the adapter and use the flange bolts coming out of the adapter rather than the flange. Don't forget the wax ring or waxless seal under the adapter.