Just as an update I went ahead and purchased the American Standard Cadet 3 dual flush right height elongated.
Install was much easier than the Champion 4 for following reasons.
1. Cadet 3 is lighter and little smaller.
2. Do to bathroom design had much larger area to work when installing the cadet 3.
3. I just used socket set to tighten instead of those cheap plastic things that act like wrench.
4. Since this was was second complete install had better idea of what I was doing, even remembered to pick up longer supply line.
Time will only tell how the dual flush works. So far no problems but its only been in place for a day.