Would it make sense to upgrade? I've been away from things for quite some time so i haven't done much research on Lion, but at first glance it seems mostly like a GUI update. I'm a poweruser and I couldn't care less if my Mac had the feel of an iPad or was made simpler for the inexperienced user - in fact i hate that. So would it make sense if I upgraded? Any under-the-hood improvements or actual changes in Lion? That said, I'm on a 1,1MP which has the 32bit EFI and I'm very very happy with it running SL. So would it worth it? Opinions please..