The Niagara works better than the Toto CST703/4
Not as well as the Toto G-Max and Powergravity models line.
The tray is a nice idea.
They work as a 10 - 12" rough toilet, the tank mounting is adjustable.

: I have just ordered an Elongated Niagara Flapperless toilet after much self debating between that and a Toto. It seems the Niagara has a little better ratings and is very inexpensive. Haven't installed it yet. Can anyone else give me any feedback on one they have been using?