I have a set of plug cutters (Both types, straight and tapered) I payed no where near a fraction of that price. I use the 3/8 mor than any as I cover screw holes with bungs, etc. But I also use 1/2" and Repaired a wall using the 5/8" and I plugged the holds from drawer handle using the 1/4" so each has use. I also have a set of counter sink drill bits (although I do not have tapered bits (waiting to see them on sale) but most of my furniture screw holes I do as Counter bore, & shank hole on the drill press. Also I use a step drill similar to a Kregs drill bit, more than the countersink drills. The counter sink drills I use when doing "off campus" work or installing the cabinetry I am building.
A Jim Dandy set it is but the Price is a Joke compared to comperable items sold seperately (at other suppliers)