Big and heavy? no they are lightweight and compact. Probably the most used tool I have and used for everything from little 15mm screws for kitchen door hinges to driving 150mm coach bolts. Takes every tip and driver I could possibly need, and with adjustable torque can be dialled in for the largest to the smallest screws. If you're on the 18v battery system like me, why wouldn't you?
Adjustable torque? I only have one impact driver. It has no torque setting. I don't see how a torque setting could work on an impact driver. Do you have links to one?
