Instruct: Classify Amazon reviews into positive or negative sentiment
Query: unsatisfactory

I have purchased 4 or 5 Caruso hairsetters over the years and loved them! I used them at least 5 days a week and they usually lasted 3 or 4 years. This one is different....doesn't heat up properly and wouldn't curl my hair. Since I used it, I didn't feel right about returning it. I still have the curlers to use with another unit. I don't know if this is an isolated case or if the product quality has changed.