I chose it because it looked like the Apple Mini Display Port and had good reviews (generally). And....it was half the price. So, I bought it, and it works fine. I've used it only once for a presentation from my computer to a projector, but it worked without a hitch. It seems sturdy enough, so it seems like a good buy to me.
Purchased to add second monitor (15" ViewSonic) to new Macbook Pro with retinal display. This adapter works well. Great video output (especially for VGA). No problems with setup. Have had no problems or issues with this adapter thus far.
This was not the cheapest of adapters, but no where near as expensive as the Apple brand. Good quality products from Cable Matters, I have purchased several different products from them and been happy with all of them.