I was in Japan for two weeks and at first I thought I really liked them. The ones I used had heated seats, ran speakers with the sound of water to cover up any uncomfortable sounds others may hear, and had the all-important bidet. The one downside that made me get tired of them though was the small toilet hole. The toilet seat itself had most of those gadgets embedded in it and thus took up quite a bit of room and I’m used to the long type of seat with an opening at the front. I didn’t have a comfortable position for both by butt and penis to fit comfortably without a bit of an ab workout so they got old for me pretty quickly. I recommend just sticking to an installed bidet if you’re larger than the average Japanese man.