I have a 13" 2010 MBA (1.86/4GB/128GB). Just wondering if anybody here still using the 2010 model? How is it holding up? Does the fan kick on more often than not when you have multiple browser tabs open or when playing video? Have you noticed any slowdown overall in general operation, boot times, wake up from slept etc.? Finally, when do you plan to upgrade from the 2010 model if you haven't already?