When you connect the sticks automatically opens the browser with the Web interface of the stick. There, the current speed (2G / 3G) is displayed in bar (0-5). The display updates itself every second, so one can easily carry around the device until you have possibly found a better position to receive the stick.
The user interface is kept simple, so that even a beginner so clearly comes. The PIN and the APN of the provider has been registered, it is directly connected to the UMTS network. The web interface also has a counter that. The time and sent / received / total MB of the current connection and displays since the last reset of the counter
Also under Linux (Fedora 19 and 20) it works fine. He behaves like there is also a network interface card (see description above).
On the negative side, the June 2014 cross-site request forgery attack (vulnerability) has been known in the E303, which allows that when you call a manipulated website may send this paid SMS on the stick. Since the manufacturer has still provided no update available until now (mid-Sept 2014), I pull this off two stars because not gefixte vulnerabilities are an absolute no-go! Even otherwise the drive has in the 1.5 years that I have it now, never been updated.
More info: Updates can be when then searched only through the active UMTS connection and recorded (when things were a).