When connecting there was a problem because I use the router behind my Fritz! Box. This I could not access it from my PC, which is connected to the FRITZ! Box to the router. That was then but just fine with my tablet, so I was able to make the initial setup quickly.
There were then but first problems because our wireless stations received no contact with the Internet again.
Since I have little idea of the matter, I called the free 24-hour hotline. There I had a competent partner immediately on the line, which has narrowed down the problem with me.
The cause of the error was that I had not switched the router in the "Slave" mode, and thus he was in competition with the Fritz! Box.
Since this issue is resolved, the router operates as an extension to the existing network completely stable and trouble-free.
A great device that my claim in full.
From me a strong buy recommendation.