The Dewalt is not a true worm drive, no gearbox. It's a left blade, full size direct drive. Despite that, today it made about 30 crosscuts on 2x4's and ripped a sheet of 3/4" CDX lengthwise, and had plenty of power. And it has a rafter hook. Makes my little 6.5" battery saw feel like a DIY toy. I can surely see it being used on roofs, rafters, knocking off a few cuts rather than running a cord, etc.
It's not going to replace the corded Skil's, but it sure will compliment them. I'm thinking to run a 40 tooth finish blade in it for cleaner cuts on 1x pine board. With what little it did today, I'm impressed, we'll see how the battery lasts on the next deck job.
The only con discovered so far is the safety on the trigger. A 1/8" hole and a loop of black tie wire will fix that, just don't tell those OSHA pricks.
Hope nobody was standing under the Dewalt above.