3 different modalities. Some techniques are less invasive than others. Less invasive technique requires less trust up front. My chiro has an intuition on what's going on and uses a small hand tool to make adjustments.
If the business is "desperate" for office visits or signups, then run away.
I can't say enough good about my chiro. He enabled healing in ways I could not even have imagined. My life is better because of his influence.