Hey, the adapter works fine on my Macbook Air 2013. And although at one port, so no matter whether VGA, HDMI or DVI. The gold contacts look good and raise the quality. The build quality is fine, but not spotless (minimum edges between (glued together?) Plastic parts to see. That's not bad for the price. The end with the Mini DisplayPort provides quality than the small "box" connected to the outputs.
I opted for the adapter because I wanted to have (for older monitors OAE) and a VGA output, without having to buy multiple adapters cable, whenever I connect something about DVI. Hereby I am well served.
Strong buy recommendation (at least so far, if change my qualitative assessment, I will adjust this Site).