I have to say I'm truly surprised by the number of negative comments on this issue. When I started to read it I assumed it would be fairly heavily pro-chiropractors. I thought most people now accepted them as legitimate (if limited) practitioners of a field of therapy/medicine.
I've personally never been to one, but I know many (more than 10 off the top of my head) people (including DW) who have used them for various issues, and have been helped noticibly. Most have to visit a number of times at first, then work down to occasional visits when something comes up. We belong to the largest HMO in the country, and they've been paying and recommending chiropratic treatment for quite a few years, although I don't remember exactly when they started. At least 7-8 years. Sometimes you have to bring it up, sometimes the docs do, depending on their opinions of the treatment. But if this fairly conservative company covers it, I would assume they were in standard acceptance. Sort of like the post office recognising Santa by delivering mail to him
As far as the horror stories, DW used to work in a hospital, and we've heard our share related to regular medicine too. I think anytime you are messing with the human body there are going to be mistakes due to incompetence, bad luck, whatever. That's why I try not to see any of them too often.
I think they are a valid form of physical therapy, although I would never go to one for anything major without discussing it with my GP first. I also think acupuncture has it's place in the medical pantheon. I'm not sure about some of the more obscure althernative medicines, though, not having had much experience with them.