I too recently installed a Champion 4. Some observations and issues: the flush handle mechanism is cheap plastic and can barely lift that huge 4 inch flush valve. I replaced it after a week with a nice universal all metal one. The toilet seat is junk. Replaced it as well. The huge 4 inch flush valve is an issue all to itself. When you flush, the float/flapper pulls off the seat and lots of water gushes down past the float and into the bowl. Well, so much water gushes past the float all at once, it immediately slams the float back down onto the seat. Only about half the water in the tank is emptied. I’ve played with the chain length and it makes no difference. It’s almost as if it is designed that way. Flush and release for a light flush, flush and hold for a complete flush. Even a flush and release does seems to empty the bowl, but why only emptying half the water in the tank? Overall it seems to work OK, but my 10 year old Kohler’s work good too and have never had a problem with them.