Unfortunately I can't use their product, but if I could I would in a heartbeat.
I've read so many good things from other people, they are very open and active on their website (https://blog.init7.net/de/) and in the networking community.
Of course 25G is an insane Speed for a residential (!) connection but having is better than needing :)
Also if you buy a 25G you will have to deal with a more advanced router, which has a 25G interface, I belive on their website they recommend Mikrotik which is nowhere near as easy to setup as Your Fritzbox or Netgear Router.
Let us know how it goess