Conclusion:
If you already have a UMTS stick, this device is a good and cheap alternative to buying new one - yet still often over 100-euro - wireless router with integrated UMTS modem. Although it has always hanging off the stick in this TL-MR3020, but these can be exchanged for example, if it is even broken.
For owners of mobile wireless devices without UMTS, this router is determined very practical. So one comes with iPod touch, iPad and the many Android tablet devices much more affordable to the Internet and must be no more expensive 3G versions of these devices can buy and maybe even bind to an expensive contract.
In practical terms, I find the switch on the side and the "AP" mode: Easy to UMTS stick pull, set the switch to "AP", plug the device via the network cable to a network connection and you can already access via Wi-Fi on the net. Without any configuration! Great Thing.
Through the supplied AC adapter and the USB Y-cable you can supply this unit with any power. So you can connect it via Y-cable to the notebook out of the reach of a power outlet easily.
Tip: The SIM card in the UMTS stick must not have PIN lock, otherwise this wireless router is not so clear.
Addition:
In the train of this router makes unfortunately no fun, because if he can not establish a stable wireless connection, the UMTS stick is reset and after several reset disabled (you can see in detail in the system log). That one gets while driving virtually no Internet connection is and must ever remove the stick and re-connect.
If you stay in a fixed location where you have good coverage, then this router is working properly, however.