well i got mine and the adapter is slightly worse then my atheros AR9285 chipset in my netbook. i can see and connect to my neighbors unsecured internet with my netbook and get 2 bars of strength (signal drops out and loses connection though after a few min).
with this usb adapter, i cant even see my neighbors network. it does get the same strength/speed to my own network though, so i can tell its pretty much the same.
i am using the realtek drivers though. it does show it connecting at 270mbs rx speed, and 130mbs tx speed... which is nice because i dont think my netbook receives at above 150mbps.