Is there any legitimacy to accupuncture?

[Whateverist]

One personal story in favor of chiropractors.

In my late twenties I developed a kink or soreness in my neck that became so painful that I couldn't lay down at night and barely slept at all in a reclining chair.  My doctor could do nothing that helped and acupuncture was a joke.  But when I went to the chiropractor, he did one 'adjustment' with his hands which was an instant fix.  No woo.  No talk of a return visit.  If I experienced anything like that again, a chiropractor would be my first stop.

"Research has also shown chiropractic to be helpful in treating neck pain and headaches." ~ WebMD

Meh.

But still I wonder how homogenous they may be as a group.  Are they certified in a way I can rely on, or did I just get lucky?  It does give me some concern.