I'm not keen on the idea. Seems like pseudo-science to me, kinda like homeopathy.
My experience with chiros has been varied. The first one was about 15 years ago when an impact injury compressed my cervical spine. My right arm went numb and stayed that way for several weeks while I went over treatment options.
In my mind, it was a mechanical problem and the drug therapies didn't seem to directly address the issue. I approached a chiro with caution. He x-rayed the area and did a handful of other strength and stimulation tests. All of the cervical disks were compressed to about 20% of normal height and the lower cervical disks were the worst.
He set my expectation that the treatment would probably exceed a year of adjustments two to three times a week. The goal was to relieve pressure on the disks to allow them to re-hydrate. Shortly after the first few adjustments, the sensations in my arm began to change. Over the course of the next nine months, sensations changed and feeling came back. I continued the treatments beyond that point to try to further increase the disk clearance. A little over a year in, the clearances were about 80% of normal, which was about as good as it was going to get.
Two years ago, I had a similar episode, this time with the left arm going numb. I tried a local chiro as the previous guy was too far away to visit regularly. This chiro had a bit of a different emphasis; alignment, rather than clearance. Long story short, he wasn't effective. Four months in, no real change beyond some initial pain relief.
I discontinued the chiro treatments and tried physical therapy, along with some anti-inflammatories. Nothing has helped long term. I do have a traction table at home and when I can spend time on it, I do get a day or so of increased function afterward. I can't say for sure, but I suspect the first chiro would be able to help with the problem if I could get over there regularly.
Anyway, a lot of chiros speak in a new age blue wind, but I do think there is something to relieving nerve impingement problems with spinal adjustments in some cases. I don't think it's realistic to expect long term benefit after a small number of adjustments.