I don't have an optional adapter.  But I had great internet connectivity when I was using the D-Link router.  The only reason I switched to the 2 Wire is because I was having some connectivity issues with my computer.  AT&T didn't support the router and D-Link didn't support the modem.  It made sense (or so I thought) to get the 2 Wire combo modem/router, so that the same company would support both.  I'm worse off now than I was before... paying for NetFlix, and can't stream movies.  I can't even download update firmware in my BD player!