Yup. My first one was just an analog dial that split the intake water. I was renting a town home and couldn't put in a GFCI outlet close enough to the toilet.

Let me tell you, it definitely woke me up in the morning.

Not only an option. Extremely cheap too. Like $20-$50. I'm considering an electric one, but mainly because of the dryer. The cold water doesn't bother me at all. Though, I'm sure once I had heated I probably wouldn't want to go back to unheated.

I started with a fancy electric one. A power surge broke something and it heated up to the point where it was extremely hot to the touch. The company wouldn't warranty it because I had it for barely over a year.

I went with non powered one next and the difference is unnoticeable.

I use a cold only bidet at home and it’s amazing, even in winter (I do keep the house at 23°C all year tho)

Believe it or not, yes. I have quite cold water in my cold water lines, especially during the Swedish winter, and have no trouble using my bidet year round.

You just don't have that much temperature sensation there.

I had a heated one for awhile but I've stuck with the simple cold water ones. It was a bit of a shock at first but I don't even notice now. I've been using them for like 15 years, I'm on my fourth now.