AS toilets have become real dogs. Their quality control seems to be nonexistent. Few pros on this forum will install them because there are so many problems with them. I would suggest you look at the Toto line. Toto is the largest manufacturer of toilets in the world and not only is the quality control top notch, they perform exceptionally well no matter which model you select. Not all low flow toilets perform well. Many need frequent plunging, and many do not do a very good job of flushing. Unfortunately, many of the major brand names of the past tried to use old technology when the new low flow mandate come in and as a result are living on the past reputation. You can a link on the home page to take you to Terry's Report on Low Flow Toilets and to a complete listing of the Toto line.