My experience mirror's Rick's. Over about 6 months, I had progressively more pain and less mobility in my left shoulder area and neck. I was getting to the point where I couldn't turn my head far enough left to check my blind spot while driving. My good chiro saw me 3 days/wk for two weeks, then 2 days/wk for two weeks. He also talked through my work environment. 10 visits and following his instructions to re-arrange my desk at work, and I had full range of motion. Ever since, I go when I feel like I need it... about once every 2-3 months.
Unfortunately, that guy moved away... I don't like my current chiro as much, but he's doing ok until I find someone I really like.
Having been w/ four different chiros over the years, I think there's a lot more variation in them than in "regular" doctors. My good chiro was just an awesome doc and right on the ball all the time. Another was more "clinical" and his adjustments were too forceful for my taste. One lady I saw was just once was too small to properly adjust me (I ain't big, but she was like 5'4"!). My current chiro adjusts ok, not great, but he's a little off the deep end with the holistic high-fructose-corn-syrup-causes-cancer and chiropractic-can-heal-everything-from-sore-necks-to-impotence schticks that chiros get on sometimes.