I have a real Denman brush, (don't know which one, only that it's a small one) and I have an inexpensive knock-off which is larger. I had to remove every other row of teeth on the big one, now I like it even better than the real one! It's more firm than the real Denman.
I love it because it can get through my thick hair and it feels sooooo good on my scalp as I brush! I don't really use it to define my curls, but I can definitely feel my hair curling up when I use it to distribute conditioner! It works as a fantastic detangler as well. Much better than any of my wide tooth combs!
I also like to stretch my hair at night by brushing it back and tying it down, and my Denman knock-off is the only thing that can really help me do that!