My laptop has settled down on power consumption, although it seems to have needed several days to do so! Otherwise everything seems to be ok. Not sure I like the iPhone/Pad style system settings though, I preferred the old style, though have no issue with it on the iPhone/Pad.
As to the search facility in Spotlight, it really has collated EVERY image and allocated it under search terms. It's not perfect, but pretty darn accurate. As I said, I'm on the fence about the usefulness/invasion of privacy balance. I wonder if you can switch it on/off as so required ?