I can only speak to my own experience of course, but have been very happy and impressed by the improvements in range of motion and strength following adjustments from my local chiro. I am an amateur distance runner, and my training phases always result in needing help for low back pain and hip joint misalignments—these tuneups never fail me for those moments. I only go as needed, but the improvements are there to feel right away.
However, like anything else, I have no doubt as to the number of quacks out there, so going from direct references usually is a good idea, and then when you have a good one, don’t switch!