Not to discredit the many talented stylists-in-training of the Aveda school, but…
I went in for a basic half an inch trim. It took about 3 hours, and the student took 4 inches of hair in order to make it even. This is after she had to get her instructor to correct her mistakes.
I'm not someone who really cares about the style of my hair, and I knew what I was getting into in terms of time. So it wasn't exactly a horrifying experience. I understand that the only way for people to learn is by doing. I paid my $20 and wrote it all off as having helped someone learn. Still, I haven't been back and don't plan to. I'd much rather find someone that A) I know will give me a good cut and b) can go to on a regular basis.
The school is what it is—a place where people are LEARNING to style hair. It's a mixed bag. You could get the best student in the class or the worst for a fairly cheap price. Go at your own risk.