Then why does "impact" enter into the discussion at all?
I'm a big fan of my impact driver. (The set he referred to included a
drill and an impact driver.) It's excellent for driving lag bolts,
and I use it for machinery (dis)assembly too. It's much shorter
barrel allows me to get into tighter areas, and mine's also got a
light (for installing cabinets) and an excellent clutch. The only
beef with mine (the Panasonic) is the forward/reverse switch. I've
changed my grip to avoid accidentally hitting it though, and it's a
real nice tool for me.