I have the gold series and the fusion brushes, both 20mm. I have a smaller size brush itself in the fusion. I didn't care for just the regular CC brush myself. But I wouldn't trade the two I have! I love them. The 20mm works well on my very thick cotton haired girl and my thick haired puppy. It works well on silky hair too, but I mostly use a comb on her.
Oh, I ordered both of them from
www.NeedsNDesires.com when they were having a sale.