Question about AVM FRITZ!Box 6690 Cable

Has anyone already had experience in Switzerland? I would very much like to replace my junk Sunrise Connect Box 2 with a router like this. According to Sunrise support, it should work "in theory". However, any liability and support is excluded. So I am in the situation without a clear answer and don't necessarily want to spend 280 CHF for a try... (I know bridge mode, but don't want to have 2 devices in operation)