Unfortunately, it does not do anything it promises. The straightening it does is minimal, almost imperceptible. The frizz remains exactly the same, while other brushes straighten and reduce frizz, making the hair smoother. It is not worth its money, it does nothing, you don't notice any difference in the hair. The temperature it claims to reach is probably virtual, and I think it damages the hair.

-Negatives: There shouldn't be a single knot in the hair. On thin and very long hair, the only thing it can do (at least in my case) is to leave it as it is with the hairdryer. It damages a lot of hair, in the end the brush is not something better. It is not at all what is advertised.
-Positives: It significantly reduces straightening time. From one hour it took me, now it takes half an hour. With one pass of the straightener, I'm good to go.