Last year we had a 'Japanese' loo installed. It is AMAZING!! It washes and dries, you can alter the water temperature, and whether it washes the front or behind, the loo even lights up at night, and the whole thing comes with a remote control. It does take a while to dry you, so if in a hurry we use a personal towel saved just for that purpose.
A couple of months ago I had to have a Colonoscopy, which for those who haven't had one, involves taking a very strong laxative which causes frequent rush visits to the loo, both the night before, and the morning of the procedure. I read up about it, and lots of people warned about it causing you to become very sore due to the amount of wiping after each visit. I'm happy to say, that the 'Japanese' loo, saved all of that, and I felt really clean after each trip to the bathroom.
I highly recommend them.