Tell me which home appliance you regret most?

Yogurt machine, when I bought it, I felt very healthy and did not contain preservatives, but after I bought it, I felt that it took 8 minutes to make yogurt at a time, and it could not be stored for too long, and the taste was not as good as that outside. Besides milk, you need a starter when you make it. When you want to make it temporarily, you can buy milk in the supermarket, but the screwdriver is usually found online.