I use one of these at work and the balance, speed/torque performance is superb and up to everything you'd expect from a professional 12v drill. We reckon DeWalt is the "Rolls Royce". This one is an ideal weight for work combining drilling and driving. Let's face it, if you are doing a lot of large diameter holes in masonry and no screwdriving you would get an 18v hammer version, however this sort would be too heavy for general stuff.
Beware though of overcharging the batteries. This shortens the life and they are not cheap. Switch off the charger when the light stops flashing but follow the instructions for the occasional "maintenance charge".