Personally I never use them. If you use good technique there is never any reason to cut yourself. If you do cut yourself you were using incorrect technique. It is fairly easy to learn 6 or 7 different knife grips and how to use them safely and efficiently.
I'm in a similar mind as Robin on this,( particularly; as he taught myself and a few others how to carve safely a couple of years ago
) though I do sometimes use a kevlar glove if I haven't done any carving for a while.
As well as technique; you need to factor in the suitability of the tool you are using and the tool's sharpness.
If a cutting tool is blunt; it will cut you accidentally, far more easily than a sharp one ever would.
A point to remember ( no pun intended, but what the hxll!
) ; a normal kevlar glove, will not protect you from puncture wounds, such as you might get if you slip and stick the tip of a knife into your palm. They are more for sharp edges and slash/incision protection.
There are numerous different types of glove with a range of "protection levels" you'll need to try a few, as different gloves of the same levels will have different "feel" and flexibility for example.
R.B.