In researching toilets, i have been told not to purchase a skirted model because if you need to replace the toilet seat, it is nearly impossible to do so because you can't get your hand in the little, removable opening to reach the bolts. I am interested in a skirted easy to keep clean../but hesitate to have to deal with this kind of problem. Anyone have any experience with changing toilet seats on the Toto Vespin or Carlyle?