I didn't do any pre pay and my chiro didn't do any fancy x rays, he just did the leg & hip, shoulder checks. But I think he did a very good job for me.. also did soft tissue work on my neck & upper back muscles..
If you have neck muscle tension or do some jerky extreme movements the adjustment can get changed, so a few return appts can be needed..
If they aren't doing anything else for muscle tension, I think that is a mistake..