I have a couple of the Champion 4 toilets and for the most part they are great.  The one exception is that these Flush Ring seals need to be replaced every couple of years.  Easy to replace but why should they need to be replaced so often?  With all of the highly educated engineers at American Standard you would think that someone would develop and flush ring seal that would last.  Other toilets do not need to be repaired so often so why this one.?