I bought it and fell in love... it is unique!!! My hair is curly from the roots and even though I have been straightening it with a hairdryer since I was 15, I mean it is incredibly unruly... that's why I put some hair oil or baby oil after rinsing, and with this rotating brush, it becomes wonderfully soft, shiny, and lasts up to 7 days, of course, if it doesn't get wet... however, since I have long hair down to my shoulders and it's thick... I separate it with about 30 small clips and do it one by one while wet... if I dry it, it doesn't straighten properly... but I have mastered straightening because for 50 euros I would only go to the hairdresser twice... as for the electricity, it is negligible... one kilowatt per hour is 10 cents, so my styling costs me, including the products, at most 1 euro, and I'm saying a lot.... The purchase is incredibly worthwhile, especially since everything is done with individual cleanliness in our home and not at the hairdresser's with... shared everything.... and I wonder why not everyone has such a brush at home to always have clean and styled hair