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I just bought a "new" MacBook Air 13 spec'd out. It's new but considered the Early 2015 model. Double edge sword though as I like having the USB ports but clearly Apple is moving in a different direction and we probably won't see direct USB ports.
I had a mid 2009 MacBook Pro and went to the Air and it's way faster and much lighter, etc. But clearly tech has advanced so if you have the money for a new Pro and are willing to buy the adapters, go for it! That's said, the Air doesn't disappoint.