Tiger, sure a rotary is a superior tool, but when you're 30' up on a ladder drilling a couple of 1/4" concrete plug-anchor holes for a wallpack, nothing beats the portability of a cordless, not to mention the lack of line power in a lot of locations. I keep a good rotary on the truck (Hilti) too, but usually only break it out for super-deep or super-fat holes.
I really think the introduction of cordless tools with the technology of reliable batteries has revolutionalized our industry over the past decade and a half or so. I dont know how we got along without them before...
