You sure have a knack for finding cool stuff.
I haven't used a cordless before so I'm kinda suspicious about how strong they are.
I use an old corded Craftsman roto tool/grinder, and a med and small air roto tool.
Pops bought me a Craftsman version of the Roto-zip, the thing that looks like
a router but with a drill bit that not only drills but cuts sideways, kinda like a
jigsaw but much faster. It can do some awesome things.