The performance of Wi-Fi is not appreciably, that's why I sent the whole back today and can anyone advise before buying, here ma'd better burn the 10 euros that saves trouble and above all the risk that even a MAC OS limp makes.
So what a reaction of MAC OS I've never seen before, even if you have plugged in the antenna at boot, the device got stuck and boots nonstop with a distorted sound, the antenna you had thus only stuck in, if you already restarted had and when you had bad luck, other USB devices were not found until one has restarted.
The software was often depend simply did not appear, therefore you could not connect to the Wi-Fi ...
So do not touch!