many bows now have somekind of vibration control built in. Do you still need this?
No, the only thing we need is a bow that propels the arrow forward in a relatively straight line. However, when we pay $700 for a bow, it's for more then that. We want as little vibration as possible, low recoil, low torque grips, strong materials, etc. Very few of us wouldn't pay $20 to reduce vibration even further.