Aside from the redundant name, these look like a universal set of the old step drill favored by electricians. Pretty darn impressive (and also yourself for drilling steel overhead).
I agree w/you about the review conundrum. Hate to write one unless I've become fully familiar which usually means a few years of use and no longer available. Can say that this neat tool I own, a "screwdriver", is well worth the price versus using a coin or other body part.