I've had mixed results. I found mine through word of mouth/referrals.
One guy bruised me badly
One guy helped my migraines immensely, but then he moved away
One guy told me he wrote a book on curing arthritic joints (his accupuncture did nothing for me)
So, I think it depends on the practitioner. I will say something about the one guy that helped my migraines the most - during a session with him, I would always fall asleep. Kinda crazy, huh?