Over Christmas break I had access to Sally's and I couldn't resist the Denman. It's sleeker and just feels like better quality. It has less teeth and is a bit smaller but it does it's job.
For me other than it looking better it doesn't detangle my hair any better or worse than my knock-off. My Goody brush costs around five dollars and the Denman was ten. For price, I'de say go for the Goody.
Now that I have the Denman I'll probably give my Goody to my mom to use in her and my sister's hair.