I just installed a new Delta Corrente today. I decided on it because of several unique features like the tank bolts do no connect through the tank and the supply line connects through the top of the tank and the flush value is almost 4 inches. It's the only toilet I've seen with these design features. I'll report back how it holds up and performs. So far the only thing I didn't like is the seat which I replaced with the slow close seat I already had.
I was really tempted to get the AS Champion 4 because of the videos I've seen of it flush and I thought the flush valve issues were fixed, but some on here were saying even with a new Korky seal some say it still leaked.