For curls the rotating round brush is not suitable course, but it is too big and too soft. And you would actually need to clearly indicate that the small round brush is not rotating (shame!).
I use the rotating brush to simply bring some order in my hair. They are shoulder length, and the structure I inherited equally by my mother and father: extreme frizzy and dry hair (maternal) and extremely thin and greasy hair (paternal) have with me thin, basically straight hair with a slight tendency to Krause result (which of course comes to light especially at high humidity, and ensures that my hair one hand like a form easily curled "mat", but then keep hairstyles pretty good)
And for this hair structure with very light, basically invisible Krause, the device is perfect. After a very short time I smoothed, shiny hair that no longer hang around unmotivated, but fall in beautiful strands and bend at the tips outwardly or inwardly.
From me: All thumbs up! 1 star deduction, because there is no second rotary attachment and because the brush in the cooling stage does not rotate. Otherwise top!