I don't think the brand matters as much as the installation and the complexity of the unit as far as longevity is concerned. If installed correctly, and you buy a unit on the lower end of the efficiency spectrum without all the variable speed motors and other complex circuit boards, you'll be fine. There are only a few manufacturers of compressors, condensers, evaporators and the associated fan motors, and they are used throughout all the brands. I wouldn't hesitate to buy a Goodman unit if installed by a reputable dealer.