This is an old thread, but since it was bumped, I'll add my 2 cents from the last time I posted in it. I hate to admit it, but my Butterscotch Manchurian M7 has turned out to be one of the best brushes I have ever owned or used.
I'm not sure if all the Manchurians are like this, but mine from a couple years ago, has no scritch and no scrub, just the way I like it. The handle speaks for itself and is flawless. I have other brushes with more sentimental value, cost/performance may be better, funkier colors (disco etc) but the M7 is likely my best overall brush.
I have 2 Manchurians, a "Hive" and a "Jubilee." The Hive was one of the earlier limited editions they used to showcase the Manchurian knots, and I find it to be a bit too dense with a loft a bit too low for me. It's not my favorite brush. The Jubilee, however, is a later model brush and is, frankly, an ideal combination of density and loft. In the time between the Hive and Jubilee, Mark and his team really optimized the knot parameters to have a soft-tipped brush with backbone, but exceptional flowthrough for a dense brush. If I were still in the market for brushes, I'd buy another Manchurian in a heartbeat.