I dont have that exact one but I like mine, I can skip the blowdryer step and flat ironed hair still comes out nice. Of course I haven't tried it with my whole head, just leave out area when I'm doing half wigs.
Went to Sally's the other week to see if they had it in stock, they didnt, but I saw one that looked almost exactly like the Denman in CVS.
I've used my Denman brush like this on a client but she thought it was too rough so I stopped using it. I don't notice much of a difference between using the brush or the fine tooth comb we use in the salon. I want to see a diff. but it ain't happening.
Also, the bristles on the brush are bent from the 5 times I've used it
In the end, I don't think it's worth it.
I'm a 4a/b transitioner with 1 year's worth of new growth. For the first time ever I have silky straight hair from flatironing. This brush really worked for me!