Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great idea with fatal design flaws

The velvet around the roller is great but, like everyone else said, the slot on the roller leaves crimps and the dumb metal clips they give you do not keep the rollers taut enough to do a good job. My hair is easy to curl and even after hairspraying it, and keeping the rollers in for 20 minutes, while the metal clips burned my scalp and neck (I literally had to lift them away from my neck so they wouldn't burn me), I still ended up with just slightly wavy hair and NO body nor curl at the top.. I'm returning them after just one try.