Apple MacBook (12-inch, 2015) review - CNET

"Back in 2008, I was correct that the Air's new, stripped-down design had real legs, and would set the standard for years to come. But also true was that future refinements down the road would turn the MacBook Air from a speciality product into a mainstream one. When the next 12-inch MacBook update arrives, I suspect it will at the very least add a second USB-C port, and that's when it will become much easier to recommend to a broader audience."