I'm toying with the idea of starting another thread for the Champion 4 toilet - I don't think the latest version of this toilet is deserving of the "bad press" it's getting here.
I installed a Champion 4 toilet in October of '07, purchased from Home Depot. I had just returned another brand after having two bowls that rocked and would not sit flat on the floor.
As others have said, there is a contradiction in the instructions between the printed instructions & the ones on the plastic gasket package. I did not heed the instructions that said to tighten the bowl/tank bolts by hand only with the provided "socket" wrench, as this was not tight enough and the tank would move. I ended up using a deep well socket & ratchet. DO NOT tighten the bolts until the tank touches the lugs on the bowl - this would be WAY too tight and would likely crack the tank.
So how's it work? Well first of all, they must have redesigned the flush mechanism somehow, because I do not believe it is any louder than any other toilet I've heard. No complaints at all with a loud flush.
No problems with the flush valve leaking or not working.
What I do like is that IT DOES NOT CLOG!!! The toilet we replaced (a miserable low flow Mansfield from '95 or so) would clog every day or two. Can you imagine how sick we were of that after 10 plus years! The flush on this toilet is great, not a single clog after almost 3 months. I have noticed when cleaning it, the porcelain inside the bowl is extremely smooth & slippery, which must help.
So I'd have to say, in my experience this toilet is not deserving of the bad rap it is getting here, it has really been improved. I'd recommend it.
Dave in WI