Given all of the boys and the cleaning issues, I'd consider the Ultramax II. The toilet can still sweat if it doesn't get a chance for the water to warm up some in between. Pouring cold into cold still means cold. Cold into warm, you have a chance. It should not be anywhere near as much an issue as the old one since most of the water will come from the storage bladder tank, and hopefully, that has had a chance to warm up some, then you have the water in the pipes in the house. The bowl cleaning on the II enhancements is nice, and SanaGloss does help as things come off easily...think freshly waxed car - the surface is much smoother.