We want to replace our current 35 year old toilets. My plumber recommended the American Standard Champion Pro because of its flushing capability. What are the experiences people have had with this toilet? I know Toto toilets get good reviews; however, we are on a well. We have both a water softener and acid neutralizer and still get the mineral build up at the water line in the toilet bowl that I have to periodically clean off with a pumice stone which I believe would damage the surface of the Toto.