I replaced both toilets in my house. I had a first generation low flow and an older full flow toilet. I put these in and put the plungers in the basement! Never again will I plunge a toilet! I have tried to plug these toilets and can't. I've used half a roll of paper, and I still can't pug it! The toilet seats are cheap, but get over it. The toilets were inexpensive enough that you could go get a much nicer seat and still be further ahead!! The one piece rocks. It's very easy to clean! Also, the Fluidmaster guts are a definite PLUS! One thing to be aware of, the tank is very small. I had to paint behind the tank because so much more of the wall was exposed!