Just thought I'd share. After a month with ML, I reinstalled SL today, using a time machine back up. The only things I really liked about ML were Notifications and iMessage but, for me, they didn't counterbalance the slow boot and shut down times of ML, and I really didn't see any other major positive differences in the OS that would make me stay with it. I can't even use AirMirroring because my MBP is too old, so I need to use AirParrot with either OS. I REALLY wanted to like it and stay with it; maybe will try again around 10.8.5 or so.