I recently won this from Sophia's blog giveaway and thought I'd pop up a review. I've tried one of these before for Normal Hair, you can see the full review here. In many ways the review of this one is very similar, but definitely more suited to my hair. I've always had fine hair but a lot of it, so finding the right brushes has been quite difficult. My hair is now shoulder length, and I'd say the brushes are designed for my length and longer hair. They're suitable for wet or dry, and all textures of hair. The Untangle Your Day brush makes getting through my hair considerably easier without any snagging. The one for fine glides through even easier than the normal one and feels a little softer when both used at the same time, although the fine one does flatten hair a little more. Having them side by side, it's really difficult tell the difference between the design of them but am guessing it's the positioning of the different length bristles (but your eyes go funny if you stare at them for too long)! FYI, there's 428 bristles positioned at 32 different heights and 16 different diameters! I really like both of the brushes and think these are much better than any other detangling brushes I've tried.
Have you tried any of these Michel Mercier brushes?