I was able to configure my 13 inch 2.13Ghz 256GB MBA exactly as my MBP is configured. This includes Windows 7, which I run concurrently with OS X apps in Fusion's Unity mode. I was delighted to discover that, despite having only 4GB of RAM, the MBA is as fast and capable as the MBP ever was. This means that for most purposes the MBA will replace the MBA. I do, however, still use the MBP to copy CDs into iTunes, so it will still be used regularly for that but few if any other purposes.