I know all the arguments against (and all the arguments for). Nonetheless my aging back needs a MacBook Air. My four and a half pound MacBook, even with wonderful battery life is too much to bear. So is the thought of using Windows 98. Otherwise I'd buy a Netbook. My last two questions are these: How many hours of word processing can I expect from the latest version of the MBA? And is there a difference between the battery life with the spinning and solid state drives? Thanks.