I have put my new Bosh drill and impact drivers to use already putting down layer 1 of new subfloor. Ironically, I prefer the drill driver as the impact driver's noise will take some getting used to, but both performed great and I was able to easily in about an hour screw all the subfloor down.

I realized though, that these new chucks will require me to invest in some new drill bits. Can someone recommend a good quality set?