We replaced the original plastic toilet in our previous coach with a Thetford Aqua Magic Style Plus w/water saver sprayer. The Style Plus has a porcelain bowl and uses a standard residential toilet seat. We liked it so much that when we bought our current coach, we swapped the plastic toilet in this one with the Style Plus in old coach. Going on 10 years of use now, and the only repair it has needed was a replacement bowl gasket a couple of years ago, a simple 20 minute job. I also used a new base gasket when I reinstalled the toilet after the move, but I don't call that a "repair".