I've had several brands, about any you can name,Dewalt-Black n Decker. They all had battery issues. They all had chuck issues. I replaced the chuck on most of them with a stronger one for about $20(I think).
Bottom line for me is, I will always have one. The best deal I can find, as long as it feels like it has some quality built in. I dont have brand loyalty here, none of the batteries last and its almost just as cheap to get a new drill than replace the battery. BTW, I have heard that the Interstate battery stores will build them for you, something to think about. I havent tried it yet, but I do have 4-5 drills here with no batteries....... /forums/images/graemlins/grin.gif