I have a mid-2010 iMac, 21.5. It was my first Mac, and it's been fantastic, never a moment's worry or trouble. However, it IS a little over 3 years old, and AppleCare expired the end of July. Coming from years of using Windows machines (HP laptops, primarily), I know that 3 years out seems to represent something of a watershed point for hard drives. Which is why I'm considering a new machine, not because I'm having any problems, but because I'm starting to anticipate them. I have an outboard Time Machine drive, and an outboard, bootable Carbon Copy Cloner drive, so I think I should be ok if my hard drive does fail, but I'm not sure I want to wait that long. I'm wondering if I'm being a bit paranoid? And, about the timing thing, I understand that, next week, an event will be held in SF, and among other things, there will probably be some sort of announcement about Mavericks going live, soon. So, if I were to buy a new iMac now, it would ship with ML (i'm still running SL, because it's incredibly stable and does everything I need to do). What are the odds that I'd be be given a complimentary upgrade to Mavericks if I bought a new machine a couple of weeks before the release date? I know, I know; nobody knows. I was actually thinking about upgrading to ML, before I realized that it would be a sort of dumb thing to do now. I was going to upgrade because I had an Apple rep suggest that my real worry was losing data, rather than the performance of my existing computer, and that, rather than getting a new machine, perhaps I should replace my existing Time Machine drive and router with a Time Capsule, and then seeing how long I could ride my current iMac. One of the reasons I went to a Mac was because of the reputed quality factor, and the fact that Apple machines, typically, enjoyed a longer usable life-span that let's say your average Dell or HP machine. And now that I have to opportunity to find out, I'm afraid to. Sorry to be so long-winded, but if anyone has any words of wisdom, please voice them. Thanks.