Oh hell. I have to chime in.
I have one of those big-ole Ni-cad DeWalt kits with all the cordless tools. My drill (most used) now smells like one of the old table top race cars I used to run as a kid so I'm guessing the bushings or something is toast. The batteries... probably 4-5 years old of heavy homeowner use and still kick-ass.
I bought a L-ion DeWalt drill to replace the race-car smelling drill (although I still run that drill, sometimes, just for the smell... for old-times sake) and... it works flawlessly.
Put me in the category of "They all work, I don't give a damn". Well, that was the truth until I saw JEV say about the lifetime warranty on the Ridgid. Then, my interest was piqued, all the way until I remembered that I have a pipe wrench sitting on my floor, 3' away from me that I've tried to get replaced under warranty and they won't give me the time of day. And that's on a tool with a total of 3 parts.