I have the classic size and thought I'd buy a mini for travel purposes but I find the bristle quality between the both different. The Classic size is soft and not at the least scratchy but somehow the bristles on the Mini are scratchier and not as soft. It still functions perfectly in detangling but it feels like my scalp is being scraped more than usual.

Does not look like much but I love it! Goes in my gym bag and every time I'm surprised at how effortlessly it goes through my hair.

I bought a mini one for my baby daughter. Very pleased with how tender and easy it is to use on her long wavy but fine hair. Can't brush her hair with any other brush anymore. Addicted! Planning to buy the middle sized one for myself. p.s. the brush (the rubber/plastic) it smells strange at first. But the smell goes away completely in a month.