I have a Black & Decker Circular Saw circa 1991. It's ok, but it has some quirks that I would call bugs. The base tilt angle won't stay at 90, the blade is hard to change because of the design of the fence, and so on. B&D has come out with upgrades to my saw that they are willing to give me, at an additional charge. And what's worse, the guy at The Home Depot was willing to let me try it for free before I bought, like some drug dealer. Now, I see that Black & Decker has a new saw with other "features", some that I like (see through window to see the blade), and some that I don't (redesigned handle is harder to hold than mine). Why didn't B&D recognize the problems that I found? Why am I almost guaranteed that there will be other bugs and/or quirks with their new saw? Or DeWalt's? or Porter Cable's? Or Milwaukee's? And how is this any different than software?