What immediately caught my eye: the range is very good, the connection of devices that wake up from standby (smartphones, laptops) is quicker than the AP vonstatten I had used before. Throughput is everywhere high (between 5-6MB / s). The Unifi controller runs with me on an Ubuntu 4.12, the installation of the controller was carried out quickly.
Long story short: I am completely satisfied and need nothing else first.
My router is from the same manufacturer, this combination is working perfectly.