It's going to be my only machine, replacing my Mid-2011 13MBA i5.
Incidentally, my 13MBA replaced a 2008 13BlackBook, which was a replacement (from AppleCare) for a 2005 12PowerBook.
All said and done, this will be more than fine for anything I throw at it!
Small problem though... it is sitting at my brother's house in Chicago, and I don't get to the US until the 30th!
So, until then, this is all I have experienced with my new MacBook:
Ah, the agony of waiting! Or just watch your brother unboxing it on YouTube....