As someone who is relatively new to contour, this brush made the leap a breeze. Again, as someone with a petite face, it's not too huge that it cannot fit into the hollows of my cheeks. What I enjoy the most about this brush though is that it can do so much more than contour. I use it to apply highlighter, and even sometimes blush if I'm looking for a more precise application. It blends colours smoothly without any hassle, and just like the rest of the RT collection, it cleans up beautifully without any hassle.
I got this brush in the Core Collection set and didn't even really want it (I bought that set for the Buffing Brush) but I LOVE this brush. I don't contour very often because it's difficult for me to get good placement and a flattering look but with the RT Contour Brush, I can actually achieve this. It is also perfect for applying highlighter because of the smaller, more compact brush head and the way it's shaped. I wish this brush were sold individually, so I could have 2 or 3 of them (it is also good if you are using a very pigmented blush - you can get it just where you want the colour and then buff it out so your blush isn't too overpowering)