Product review (5 stars): I have very long and fine hair with layers
First off, there's a learning curve with this brush. The first time I used it, I rolled my hair up to my head on accident and yes that hurt. If you use the spinning part, make sure to pull the brush down while it's spinning so that it doesn't do that. The directions say it's not meant to replace a hair dryer and to use it on at least 80% dry hair.  I have very long and fine hair with layers. I almost always air dry my hair overnight so I just use this once it's slightly damp. It really does a great job at keeping the frizz away. My hair comes out smooth and with volume, which I wanted. The hair dryer part on high is like the low setting on a regular hair dryer, so no it's not very powerful, but if your hair is mostly dry to start then that's not a problem. I've used it on my daughters as well and they have thicker hair, but one has short hair and I was able to do the flip out style on hers. Overall,  I'm happy with this purchase and will definitely continue to use it on me and my daughters.