I think the problem many people have in understanding low flow toilets is that we all were brought up to believe you needed anywhere of 3 gallons to 7 gallons to properly flush. Common sense tells us that the more water used, the better the flush. It didn't help when the low flow mandate came out that many well known brand manufactures tried to use old designs with less water and of course that didn't work, but it gave most folks the idea that low flow toilets would require lots of plunging, lots of double flushes, and just poor performance in general. Since most people don't spend much time researching advances in toilet design, this opinion remains in the minds of many consumers. It is hard to accept the fact that a toilet using only 1.6 gallons per flush will perform as well as or even better than old 3 gallon toilets. Maybe even harder to accept is that a toilet using just 1.3 gallons will do as well as a 1.6 gallon toilet! To me, an interesting thing about this is that although the toilet is the most frequently used device in our homes, with the exception of the water heater, it is the least understood. Dishwashers and disposals are used maybe 1 or 2 times per day, and showers once a day per person, but the toilet is used 3-4 times per day per person everyday.