Depending what i am cutting I will use one on the outfeed side of the blade.
I still use the factory provided plastic blade guard and pals when cutting larger sheets of plywood.
I also have a few other safety features for the table saw that are used contigent on the cut and the type of wood.
It is a bit of pain to make these changes, but I value my fingers.
Since I don't own a slider (yet) or a SawStop (maybe yet), these other safety devices are the next best thing.
Joe