I am a DIY, and was used to drive screws with a drill. THe most powerful the better I thought. This was my first contact with an impact driver. Man does that thing rock ! I own a 700lb/in + cordless drill, and thought it was it. Not for driving screws it's not ! The drill will either destroy bit, or the screw hole. Not this little guy (weighs half what the drill weighs, and offers twice the power. Well balanced, good battery life, powerful.
Only drawback, and I think it common to all impact drivers : It's LOUD !
Love this product.