I can't comment on the Mac brush, but both the Lancome and Estee Lauder foundation brushes are excellent and seem to be highly praised by others too. The quality is superb, and gives a perfect finish. I find one uses less product, and ends up with the blending and finish flawless. Although foundation brushes generally seem expensive, i do think that they are a worthwhile investment to get a truly perfect look. I also recommend you "paint" the face using small "x" crosses, and then blend these with short downwards strokes. This works the foundation almost into your skin so that it doesnt look like it's sat on top. A good foundation brush will also allow you to apply a second "coat" for heavier coverage without disturbing your initial base. I highly recommend.