I have a small obsession with technology. OK, maybe not a small one. I love trying out the latest gadgets and tech on my eternal quest to find the gear that makes me most productive and makes work fun. I've owned more computers than I can recall from almost every major manufacturer. Of all the laptops I've owned, only one has ticked most of the boxes of acceptable compromises when it comes to form and function - the 11-inch MacBook Air. And that's why I hit the used Mac sites last week.