I have bought two 115pc sets of Drill Hog cobalt drills and am very happy with them.
I bought one for myself, and one for my work. My guess is that they're factory seconds from some brand name manufacturer, although I don't know that for sure. The drills do not actually say USA on them, but regardless, they appear to be ground from quality material.
I inspected every drill when I received each set and both sets came with around 10 drills with inadequate grinds and/or a slight bend. In both cases I sent a list of sizes to the seller and was sent replacements asap, no questions asked. I was not asked to return the originals.
Now both sets are complete and they cut as good or better than any other name brand cobalt drill. I run the work set on a cnc machine in a variety of materials including stainless and 4140ht with no issues. The ones that have dulled over time have been proffesionally re-sharpened and then continue to cut like new.
I highly recomend the drill hog sets, I doubt you could find a better value. Just inspect them all on receipt and get the rejects replaced. Our apprentice also bought a HSS set of drill hogs which I inspected, and every piece was good in his set.