mac are the worst!! they shed everywhere and my foundation brush has broken (the metal came off of the wood).
i my bobbi brown ones though.
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"i tell you one lesson I learned
If you want to be something in life, You ain't gonna get it unless, You give a little bit of sacrifice, Oohh, sometimes before you smile you got to cry.." -The Roots
I have a Prescriptives foundation brush I've had for years and it's held up really well. My blush brush is from Nars and I can't say enough good things about it. I also have the Nars bronzer brush (fat short brush) and it's great for overall application.
If you're looking for a set, Trish McEvoy brushes are the best. I also like some of Chanel's brushes. They have a mini-set out for xmas I believe. It's a good time of year to get brush sets since a lot of companies are offering specials. Good luck!
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http://v247.tumblr.com One cannot perceive beauty, but with a serene mind -Thoreau
If money's no object, go for the Kevyn Aucoin set. The blush & face/powder brushes are to die for. However, Trish McEvoy, Anna Sui & Fresh have great prices & are worth the $$$. Good luck.