I'm happy with the dpm system - DPM CZ P-10 F/P-10 SC 4.5in 9 mm Mechanical Recoil Reduction System

So far, ive only shot with the longest spring. Made huge improvements in recoil. However, i did have feeding issues for the first time (handles +p perfectly). I had several very serious malfunctions.. I just switched in the medium spring but havent shot it yet. I'm assuming one of the shorter springs is going to be the ticket for range ammo.. all of which will provide substantial recoil reduction compared to the stock spring.