I'm just trying to convey my experiences with bathroom remodeling on my own house. Anyone is free to listen or ignore my advice.

I never said it wasn't a valid idea. It's just a hard and expensive one. You guys will find out once you become home owners in the future. Also a Japanese toilet costs the same as a cheap car. If you haven't already guessed, I wanted one for my bathroom for years now. It's just not practical.

You don't need a full unit - you can just do the seat:

http://www.amazon.com/Toto-SW574-01-Washlet-Seat-Elongated/d...

That + drywall + electrical is maybe ~$2500.

Sounds like the only expensive part is if you already have expensive deco.

I don't agree, he's raising exactly the sorts of issues many householders would have. Even just the cost and hassle of redecorating/retiling would put most people off.