I've been using a 2008-2009 Airport Extreme base station and last year extended my network with an Express station. My internet has been wonky as of late so not knowing where the problem was I purchased the latest Extreme station today and upgraded my modem to the latest and greatest that offers the ac spectrum. I use the Airport Extremes out of habit because as memory serves the Xfinity modems didn't offer router functionality back in 2008 and it was that or link sys. Here's my question. What is the advantage of an Airport Extreme instead of the router from Xfinity?