I still prefer the hole hawg for drilling out a whole house.
My 12V Hitachi impact is great driving screws and lags but its a bit slow for drilling.
I've been using Lennox 17" ship augers with double cutting edges. It can take quite a few nail hits before it needs touching up. With the 17" length I don't need the ladder with 9' ceilings or less. Also if I hit a nail in an area where I'd rather not make a second hole a can force it through, usually without too much damage to the bit.