I am sort of a "TOOL NUT" so for me it's not over-kill, but you need to really understand the following:
No matter which set you buy, the one you posted, Brownell's, others.... there will ALWAYS be a screw that you won't have a perfect bit for. I work on all different kinds of guns - Foreign & Domestic, and once in a while I wind up grinding a custom bit. Brownells's sells the grinding wheel that is just the right radius for hollow ground bits and I recommend that you get one. They work better and easier in a drill press, however if you don't own a drill press you can just figure out how to mount or clamp a portable drill for the task. Not only will you be able to custom make your own special size bits, but you can sharpen and repair your existing ones.
Brownell's brand bits come with a lifetime warranty, and if you break one, just call them and they'll send you a new one. They are good quality as well and they have a very good choice of handles. I would recommend the regular "law enforcement handle" as they call it.
And by the way you are correct about the older Smith's.......... they do have those pesky thin slotted screws!
Chief38