I would have to agree with others here have stated... that the hand shock in the Parker UL31 can be tamed significantly with the right vibration dampening accessories... I currently own 2 Parker UL31's ...one camo for hunting and one I use for 3D Archery Competitions.. as seen below

I as you noticed a pretty harsh hand shock when I shot the bare bow , But I was very impressed with the bows accuracy and performance and the bow met the criteria I was looking for in a bow at the time ... being only 5'4 with a 26 inch draw and shooting 50-60lbs the bow seems to fit me like a glove... I knew that once I outfitted the bow with all the vibration dampening goodies I could tame the hand shock and noise... and it worked ...I have had folks comment on the quietness of the bow... and the bow has performed wonderfully for 3D archery and for bowhunting..... I have tried many different stabilizers on the UL31's from Doinkers to Vibracheck etc... and found the Carbon Impact 3 Carbon Rod 10.5 inch stabilizer to work the best for vibration dampening and quieting the bow for 3D and I sometimes use the 24 inch 4 rod stabilizer ..depending on what class I am competeing in for 3D comp.and I used the carbon Impact 10.5 carbon rod stabilizer for bowhunting last year on my Phoenix 34 and was very successful with it.
If you are focused on purchaseing a Parker bow looking for a VERY QUIET smooth shooting bow check out the Parker Phoeinix 34... it is the quietest bow I have hunted with so far