I use The Stuff on Mocha every time I brush him. You don't want to brush their hair when it's completely dry because it'll be more prone to breakage/damage. So I spritz The Stuff on him before I brush him. It does a good job of untangling and makes the brushing go smoother.
I don't really understand why some people are saying that it is heavy and weighs down the coat
I guess if you spray on a ton of it, it would weigh it down...but if you just do a light spritz, it shouldn't be a problem. My Mocha has fine, thin silky hair. After I spray it and brush it through until it's dry, it doesn't feel heavy or greasy on his coat at all. I also like it because it freshens him up in between baths.
I tried the CC Ice on Ice one time because of the rave reviews, but I immediately returned it and went back to using The Stuff. I think if anything, the Ice on Ice is the one that feels heavy and weighs the coat down. They're very similar products, but I found the Ice on Ice to be too greasy/oily feeling.