The size is about the width of a hand, and the handle is slim and curved, so it feels great to hold lol. I've become more obsessed with volume lately, so I bought a small roll brush and I'm satisfied.
Using the tip of the brush handle to section and lifting with a quick motion while applying heat works really well. If you look closely at the brush, multiple bristles come out of one hole, so it grips hair better. Brushes with just one bristle per hole don't hold as well as you'd think.
There are many cheap brushes on the market with single bristles per hole and some aren't very pretty (and looks are important, right? If you're going to use it anyway, it should look nice). I was hesitating to buy one, but since it was on sale this time, I grabbed one quickly and it was a satisfying purchase.
Overall, this brush is really great.