Most people who shoot multiple types of bows probably agree that hill bows thump a bit more than a hybrid or a recurve. Given the right grip and shooting style, the thump becomes nothing more than a pleasant reminder that the arrow has been loosed.
However, some people are scared into thinking that hill style bows will require trips to the dentist or at least the chiropractor. For people who shot those bows I would recommend getting the bow looked at.
I recently picked up a used hill that was physically painful to shoot. It was loud as well. After my dad shot it and agreed something was off, we sent it to Craig. He figured out that the limb alignment was off as well as the tiller. This was the cause of the problem.
5 days later I shot the same bow today and WHAT A DIFFERENCE! Yeah it still thumps a bit but it is quiet, pulls more smoothly, and most of all is a blast to shoot. Even with a dacron string and no silencers I couldn't stop shooting!
Seriously, if you have had issues with hill style bows, look at tiller and alignment caused by misstringing the bow or something
similar. That can make a HUGE difference!