A while back I'd filed away a comment Derek from Kensington Bungalow made about really liking a Hitachi Hammer Drill he'd used.

Something like "going through concrete like butter," he said. It reminded me that I'd used one too (a Makita, I think) that we'd borrowed from the neighbor when installing the bathroom fan vent through our stucco exterior. The hammering action did indeed make the work a heck of a lot easier.