I personally don't prefer replacement bits. I haven't found any yet that fit tightly enough in their holders. They all seem to have some slop. This makes for SLIPS and GOUGES and if the blades or configuration of the tips isn't just right, it makes for galled and burred screw slots etc.
I will admit, I do use interchangeable bits, but never for slotted screw heads, unless there is nothing else available. I carry a Chapman set with me to gunshows as a "just in case" kit, but avoid using them.
I'm anal about properly fitting screwdrivers. At last count I had just over 4 dozen that are all of good quality, mostly Snap On and Craftsman Flat Blade types, carefully ground for square edges.
One of my pet peeves, is that factory screwdrivers do not have square opposing edges. Gunsmith kit style are the exception. They do cover a wide range of configurations though.
On commercial rifles, I try to swap out the slotted screws with either hex head, allen types or torx heads.
I know most folks don't have the space or equipment to maintain a large quantity of single point screwdrivers. If I were in that position, I would settle for the "gunsmith screwdriver" kits being offered. They're actually very good value and some are better than others.
Galled screw decrease the value of a firearm by way more than the value of the screws. Take care of them and take care to make sure the proper fitting screwdriver is used on them. Over torquing isn't necessary