The Edimax EW-7612UAn is great for the Raspberry Pi 2. The transmission rate in this case is the same conditions> 100MBit. This stick here really is of the transmission rates fro the last and should not be advertised with Raspberry Pi support my opinion.
Old Rating:
I ordered this stick for my Raspberry Pi, I with the little Nano USB Stick (also by CSL) high bit rate often have a hook in HD movies. Well unfortunately I had to realize that the transmission rate with this stick is even worse (Fritzbox 7490 is about 3 meters, an old wooden door in between), as with the Nano Stick: Although discovered There are more networks with better signal strength, however, the transmission bandwidth very ringed. The specified (theoretical) 300Mbit / s will you certainly never even reach approximately with this device. With other wireless devices I have in the 2.4 GHz range (n standard) no problems. The drive immediately goes back. Unfortunately, I'm still on the lookout for suitable replacement, I do not know if the Edimax adapter is great behave differently.