If all hardwired devices are placed on 3rd party giga router, your home network would be giga for device sharing. The connection to access internet would be 10/100 but as fastest speed currently available on a single pair installed 3600 is Max Turbo (24M), the 100 connection is at least 4 times faster than the speed tier. If you have Max (12M) then the connection is 8 times faster.
Gigaport would be of benefit to home network only as even the 589 gigaport RG would only have a 45M POWER internet speed availability unless FTTP Giga (currently 300M) as in Austin Texas and soon a few more select markets.
*I am an AT&T employee and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.