I talked to two friends about it--one is a music teacher and she said she never got much out of it but she hated the guy at her school who taught it. The other is a conductor who said it's "cultish," but then added that he didn't like the guy on staff who taught it. He recommended Feldenkrais, but I did that last summer and got nothing out of it other than I was pleasantly sleepy after every class.
Anyone? Whether you've done Alexander in general or for music specifically.