IF you are going to run a shock buff... this is the type to use.
Not those crap blue Wilson Combat ones. I've ran CP buffers for well over 10k rounds, they don't fall apart.
My two cents on the topic... there is not "gimmick" behind them, they decease the impact force on a frame, but doesn't really matter??... I think if your gun is properly sprung... I don't think they are of any use. However, if you are running light springs, like a lot of guys do in sports like USPSA... then I believe there is some benefit to them.
My sample size is really small... but my STI Edge which is pushing 100k on the frame has significantly less batter on the frame where the guide rod sits vs. my Springfield Loaded which has 1/3 the rounds. I, and the previous owner have always ran shock buffs in the Edge... don't run a shock buff in the Springfield. Both guns shoot 40sw, 180gr at around 940fps with 10 to 12lb recoil springs.
But I run the shock buff in the Edge because the gun is absolutely flawless with one, always has been for me, and the previous owner so I see no need to change what works, slide stop is disabled on that gun anyways so I don't need to be able to sling shot it out of slide lock.
Depending on the gun, you are correct, you will not be able to sling shot the gun.