i could not build steel framed houses without an impact driver. the bits we often use are the 5/16 roofing/tech bits. we also use no 2 philip heads for screwing aluminium doors and windows to the frames, and we also use the square head bits when we have to modify the windows and doors as the joinery workshops tend to use the square headed screws these days.
for every 1 screw i can screw in using my protool 18 volt cordless drill, a carpenter beside me can screw in 2 screws using the 18 volt makita impact driver.
the impact drivers are a necessity these days because of speed.
yes they are noisy, and yes i wear earmuffs, and yes i shout at my carpenter to stop using the impact driver when i am on the phone!
for workshop use, such as making furniture and cabinet making, i could get by with the festool or protool cordless drills.
but for general building and construction work, its a no brainer, i need impact drivers.
currently i have 5 makita impact drivers.
so the sooner protool get their act together, the sooner i can sell the makitas and buy the black and orange impact drivers (protool)!
justin.