Rouge Bunny Rouge makeup brushes don't get the same amount of attention as the color products receive, and it's a shame, really, because these tools are top notch. Take, for example, Rouge Bunny Rouge Large Shader Brush (003): It has a thick medium size head of soft natural hair (my guess is sable, as it picks and holds more product that squirrel hair usually does). The brush is large enough for an all-over lid application and has enough bounce and fluffiness to blend it nicely.
As you can see, Rouge Bunny Rouge Large Shader (003) is of similar proportions to the magnificent RMK's Eye Shadow brush L. It's not quite as thick, but close enough, and is not much different in performance, unless you're using ultra soft, sheer, and shimmery Japanese eye shadows. In that case go with the RMK brush for an even application and minimal fallout. Other brushes in this category, Sephora Pro #12 (formerly the Platinum Collection) and Sue Devitt Refined Eyebase brush (the medium size of the three eye brushes by Sue Devitt), are flatter and not quite as soft and luxurious.
Bottom Line: Excellent.
Rouge Bunny Rouge Large Shader Brush #003 ($26) is available from Beautyhabit in the US and Zuneta if you're elsewhere in the world.