Aside from the non-primitive aspect my issue with PVC bows is from a safety standpoint. PVC will degrade over time and there's no indication as to the condition of a PVC bow, one minute it's shooting fine and looking good, the next shot it can explode. Now this can be true for wood and glass as well but generally they will give you and indication they are getting old, checks, crysals, delams, creaking, etc. In the historical society I do most of my shooting in we do an inspection of all bows before they are allowed on the shooting line, not a 100% guarantee of safety but it does prevent bows with obvious issues from being shot, same with arrows, PVC bows are rejected out of hand for the fact that they will almost never give an indication they are old and getting brittle until they blow.