I have been using a MacBook Pro MagSafe charger for many months with my MacBook Air, taking it to and leaving it in my office so I didn't have to carry it to and from my home on my walk to work. Finally, though, it failed and simply refused to continue powering my laptops. Fortunately, I still had my MacBook Air charger, and so could continue to use this while I looked at a variety of replacement options. These options included Apple's own charger, but it seemed much too expensive for what was, in effect, a back-up item. I found this charger from Battery Pro, and have to say that it has been a great purchase; a quality item, at a very reasonable price. No problems noted so far, and fully compatible with both my MacBooks. Highly recommended.