One thing to consider about shock buffers in general, and particular those in handguns: the reason they're not really needed is because nature provides a shock buffer: your hand. When you fire a handgun, the energy of the slide is transmitted through the frame and grips and into your hand. And 99% of the time, your hand absorbs the energy just fine. (HEAVY MAGNUMS EXCEPTED.)
Some people picture the slamming of the slide into the frame as if the frame is locked in a vise. If you do lock a pistol in a vice, and continually fire lots of rounds through it, then the frame will take a beating. But your hand acts as a natural shock absorber for the energy of the slide.
Another way of looking at it: Think of the slide as a hammer, and the frame as a nail. If you try to pound the nail into a piece of wood (the hand), the nail doesn't suffer too much damage because the wood absorbs the energy. If you try to pound the nail into a piece of concrete (a vice), chances are the the nail will look like a flattened pretzel, because the concrete won't give, and the nail soaks all the energy up as it deforms.
Summary: Unless the frame or the design are defective, you don't need a shock buff. If you still want to use one, it's a free country.
Just my $.02. Hope this helps.