After 13 years, I had the toilet seat replaced today due to discoloration and roughness. The original seat, an Arano S, has discolored, just like at my friend's house. Since it wasn't broken and needed replacing, I think anyone who can watch a YouTube video on how to install it could probably replace it themselves. It's severely discolored, and the discoloration won't come off even when wiped. The electrical function is fine, so it might be okay for someone who uses a cover.