I can't tell you how many B&D power screwdrivers I've purchased for roughly $30 just to have them fail after 1 1/2 years to 2 years of routine, home use.  The last time, I had it for about a year and the thing called it quits.  The first thing I realized was that I was going to have to spend around $100 for a decent contractor grade screwdriver.  This seemed like a lot at first, but after realizing that I had already spent over $100 in cheaper screwdrivers that simply did not last, I accepted the amount.