The Brownells buffers are crap, they last 1000 rounds or less. The CZ buffer, the thick one, in my match gun had over 10,000 rounds on it and is only just showing cuts into it from the slide. All 3 of my Shadowmates have them as do my 3 other Shadows. Combined total of rounds through those guns is about 450,000. My old gun has over 130,000 rounds through it, the vast majority with the buffs installed. When the CZ ones fail they don't tend to send bit and pieces into the gun, they just get sliced through by the slide and stop being buffers. The Brownells ones crack and fall to pieces.
The point about the 11lb recoil spring and light Power factor loads is correct, if you're not using buffs, although with 124 or 115 grain ammo at higher PFs a heavier spring will take the slide velocity and reduce some of the snap.
