while the mac brush sets aren't quite as great as the full-size counterparts, they are definately still worth picking up. like the live chat mentioned, they're great for travel (i shudder to think what i would do if my brush roll got lost on a plane, or something...), and they're a great way to try out the brushes if you're getting started. i have almost every single brush that has been released as a SE, and i have the full-sizes (and duplicates!) as well. i tend to use both quite a bit.