Although I'm a little embarassed to admit it........I tend to notice toilet brands & how well (or poorly) they preform.
Based on my unscientific study the toliet the Budman suggests is probably the only low water usage toilet that worked......
Champion model. by American Standard is the only one I would buy. Get this model you will be pleased with it..
Rather impressive since my 1930 house house the original American Standard toilets.
cheers Bob