I just got a brand new MBA 2012 last Monday (i5, 8gb ram, 256 ssd ... shipped with Lion). I haven't even taken it out of the box yet. I'll be transferring all my stuff to the new MBA this weekend (from my 2008 MBP). So, whats the best thing to do with the new MBA? Should I do an "upgrade" from Lion to ML by downloading through the App Store? Or would it be better to clean install ML seen as I have a fresh new (still in the box) MBA? Or is there even a difference between a ML "upgrade" and a "clean install"???