I plugged this Nano key directly to the back of my tower, which is his office, about 5 meters from the Neuf Box (Wi-Fi access point, without the addition of antenna), with 2 doors on the route. I noted no signal reception problem (note: you must also say that I do not use all the bandwidth of the wireless link, since what passes between the box and the PC is essentially the Internet traffic off I only have 4 or 5 Mbit / s ADSL, so I'm far from the maximum flow rate of 150 Mbit / s promised by this key, as with any wireless device, the actual flow rate is certainly far from such value).
The installation went smoothly (I'm on Windows 7).
In short, no problems, wireless key that works very well, which is very small which is a good thing if it is apparent on your computer (port on the front, laptop ...) and cherry on the cake, which does not cost more than equivalent keys but "classic" format.