I downloaded one (cause that's all I have room for) of the new iTunes free "HD" TV shows and 10 min. into it: pixelation, pauses, out of sync audio - Activity monitor shows maxed out, both cores -etc. I had mail, safari (one stable web page), and iCal open. I'm about ready to make a Genius appointment and try to exchange this for a MacBook Pro - even after 5 months! This latest firmware fix has slowed down my Air and I see the beach ball all the time! I did NOT have heat, or Core shutdown problems before, but Apple needs to own up to product and or firmware mistakes. It's starting to remind me of why I left Sony Vaio and Windows to begin with. Has anybody been successful exchanging for a MacBook Pro after such a long time after purchase, or am I wasting my time?