I've been to about 5 different chiropractors in my life. They all have a bit different styles ( some have you exhale when they adjust, others don't...depends on their schooling and theory of adjustment). Some are "rougher" than others (I like it a bit rough!) and with others, you barely hear a crack (by "rough," I don't mean that it hurts at all).
Some chiropractors will do extremity adjustments (arms and legs), while others don't.
Some just want to suck as much money out of you as they can (I only hit one of those so far), but most are legit. Make sure you get a treatment plan (X number of appointments per week for X amount of time) instead of something open ended (though you eventually will be on maintenance, and go to see the chiropractor as needed).
Remember that if THIS particular chiropractor doesn't work out for you, it doesn't mean that chiropractic won't. It's very good for spinal problems and back pain. I went to my first chiropractor after I fell off a horse (actually, the horse fell, I was on the horse so I fell too, and he almost fell on me but righted himself just before he did). "regular" alopathic doctors found "nothing wrong" (though it took me 15 minutes to get out of bed in the morning, crying through part of it because of the pain), but the chiropractor had me feeling better in just a couple of sessions.
Another chiropractor helped me when I had a "axe blade in the head" headache that lasted going on 4 weeks. I had x rays, a Cat scan, MRI, and noone found anything. Meantime, I was in pain every day. Then I went to my chiropractor (actually, "back" to him, because I'd been adjusted before all the tests but it didn't help) and felt better immediately.
One creepy thing is when I get my neck adjusted. I keep telling my chiropractor that I've seen martial arts movies where people are killed by the same move, but he assures me that he wouldn't know how to kill anyone. LOL!