George, that is an older drill from the days when Sioux made them for Milwaukee. The newer model is the newer one that Milwaukee now makes for themselves. I also have one of them, and 3 of the old ones. I don't do production work any more, so they last a lot longer. They are drills first, but we use them as grinders, which is hard on the bearings. Eventually the bearings will go out, as do the brushes. For a lot longer life, I always sand at slow drill speeds, with the trigger never pulled down more than half way. I used to keep a piece of cork under the trigger to keep me from pressing all the way down. The abrasives cut better at the lower speeds. Also, no more than the weight of the drill for sanding pressure. If you are bogging your drill down, you are pushing way too hard. I did try one cheap drill, and the trigger mechanism broke within the first month. I also tried a battery powered one, and I would have needed 4 or so sets of batteries to keep sanding since I tend to do things in batches. The cord is not a problem.
robo hippy