I've the big bronzer blush and the kabuki blush that both came out this spring. I agree, the price reflects the quality, and that being said, they're pretty good for the price. The MAC 187 (which I also have), is head and shoulders above the Quo brush, but I also paid 4x as much for it. I use my Quo brushes nearly every day, the bronzer for powder, and sometimes a diffused blush, and the Kabuki with my beauty powders - they work just fine.
As for shedding, the Bronzer shed a lot at first, but it seems fine now. The Kabuki drops at least one hair each time I've used it, so far. They are rougher than MAC brushes, but I can't say they "scratch" my face.
As others have said, you get what you pay for.