Kind of a subjective question, I only have my shoulder test to determine the effective recoil reduction on our storms. I believe that they are as effective as any other recoil pad that I have used. we have used some pretty expensive aftermarket units on other rifles particularly on a Browning BAR in 30-06. My wife had a dislocated shoulder when she was younger and even with the Kick-Eez pad on she was only good for two or three shots. With the Storm she has shot 10 to 15 full loads in a single sitting without any distress. That said the Storm is completely set up to her size which for me was a major selling point for the rifle. Both my wife are I are on the smaller side, stock stocks are always too long for us and on the BAR the recoil pad just made the fit worse. We generally lived with dealing with having things oversize until the Storm came along. Fit is very important to comfort and accuracy in a rifle.

Mike