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I use a Blitzkreig hydraulic and it kicks ass. Very soft recoil impulse and I have had zero malfunctions in my QC10.
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This, except I have a DDLES lower.
I have a very early DDLES Glock 9mm lower. Before that I had a 9mm with a mag block.
All of my experience has been with short barrelled 9mm ARs. That being said, I ran different variations of the same heavy buffer for years. Sometimes with a spacer, sometimes with quarters, sometimes with rubber washers added, etc.
I finally said screw it and ordered a Blitzkrieg Hydraulic buffer and spring set. I am so glad that I did. It totally changed the recoil impulse of the gun and made it so much softer shooting. I have another build I'm doing and I'll definitely be getting the hydraulic buffer for that one as well.