Are you running the Sprinco on both 9mm and the 45? With the 45 does Alan have multiple springs similar to DPM and if so which one did you go with?That being said DPM is OK but if you want to see a real change in recoil I'd suggest looking into the SprinCo RSA. Alan makes a great system and will actually get on the phone and help you fine tune your weapon to suit your individual needs.
I was hoping Alan had finally found the "perfect" design for the 45. I agree the 45 is a relative "soft" recoiler and that is probably why the DPM provides a minor improvement.I've found the Q45 is such a soft shooter the only thing I need on it is a BT guide rod. I don't believe Alan has made a satisfactory RSA for the Q45 yet. He has been experimenting for a few years but has not found quite the exact right combination for a reliably cycling system.
i am running one in my ppq and it does help however i find it to be only a slight difference. i get similar results with a stainless steel rod set up.Looking at a DPM recoil system for my PPQ. Anyone out there had any ( good or bad ) experience with them. I don't want to spend on a gimmick.