We are seriously considering switching from Comcast phone and internet to Sonic Fusion. I understand the service is wireless, which is great. I was wondering if we could use our own NetGear75 router or if we had to use the Fusion router.
Best bet is to use the router that comes with the service. It'll provide IPv6, is integrated with our support and troubleshooting tools, and also allows you to avoid any fee for truck rolls or inside wire repair.
If you have any wireless coverage issues, you can plug your Netgear in behind it - use Ethernet to another room elsewhere in the house and set it to bridge and use the same SSID and credentials and you can expand your wireless coverage. I've done this at home with the Sonic Fusion router plus two Apple Airport units at opposite ends of the house.