I just upgraded from my 2006 MBP 15". I bought it new in 2006 and about a year ago upgraded the HDD to an SSD to get more life (speed) out of it... and wow, what a difference it made! About a month ago, I got the red pixel issue (researched it to be either a loose connector or bad logic board... bad logic board); plus, I was on my third battery in 5+ years and still got maybe 2 hours (after adding the SSD). Just got my MBA/13/i7/256 (samsung, BTW) w/ TBD and it is awesome! Perfect machine in my home office, HUGE TB screen and perfect portability... getting used to Lion and now making use of mission control and launchpad - makes the 13" screen much more useable, IMO. For those of you trying to decide, the MBA is a great machine - I use if for personal/business use... web, office, mail, netflix, quickbooks and all the normal fun stuff OS X brings (iPhoto, iMovie, etc.) I don't do coding or any overly heavy lifting when it comes to photos or videos - just home stuff. This is the perfect machine for that... For me, the 11" was too small for when I am mobile - and at $100 difference with both maxed out, the 13" was the way to go for me... I also run Parallels for the few (two, actually) Windows/IE - needs... runs like a champ; better than the Lenovo my wife has for work...