Preparing for Xfinity X1 System

Question

I will be upgrading to Xfinity X1 in the near future and I'm wondering if I should foresee any problems using their modem/router.
I have a 1T Time Capsule currently connected to a Comcast Arris modem.  I also have two Apple Expresses extending my network.  All of these devices typically run well and with good speeds.  On the system, we have two MacBook Pros, MacBook Air, four iPhone 6s, two Apple TVs, two Xbox 360s, an Xbox One, and a Windows 8 laptop.  Each of the items can run simultaneously without any noticeable lags (although it would be rare for all of these devices to be using the internet simultaneously).
I called Comcast today to upgrade to X1 and let them know that use a Time Capsule to operate my home wireless network.  I had planned on just getting the Comcast devices and connecting them myself.  However, the agent convinced me to have a tech come set up my network since the new Comcast/Xfinity modem is also a router and needs to function as a router to coordinate the DVR and the two satellite units --- I have three TVs that I will have cable TV on.  The agent on the phone said it's possible to use the Time Capsule to continue operating my home wireless network AND operate the Xfinity wireless network.
Any thoughts?  Is anyone using a Time Capsule and Xfinity X1 on multiple TVs with multiple set-top devices?  Is anyone using the Time Capsule to manage the Xfinity X1 wireless network?

Answer 1

So far, so good.  I chose to self-install the Xfinity X1 --- no tech needed.  It was really just a matter of connecting the X1 modem via a coaxial cable, plugging it in, turning it on, and activating it remotely by connecting an older MacBook (that still has an Ethernet port) and logging in the the Xfinity website.  Once it was activated, I made sure that all of my devices could at least connect to the X1 wireless router --- and it was very easy to change the network name and password from the factory defaults.  All told, that took about 15-20 minutes.
I had unplugged my TC from the old modem and from power prior to setting up the new X1 modem.  Once the X1 modem was activated, a new wireless network was created, and all devices in the house could connect to the new X1 wireless network, I bridged the TC to the new modem via an Ethernet cable, plugged the power cord back in, and reset the TC to factory settings.  Once it was reset, I created a new wireless network via the TC (as you suggested) and reset the expresses around the house to extend that network.  At the moment, the TC is running its own wireless network alongside the X1 wireless network.  All of my devices are able to easily switch back and forth between the two networks.
I haven't set up the X1 entertainment system (i.e., DVR and satellite HD cable boxes) on the X1 wireless network yet, which is required to operate the system and play TV, stream movies, etc.  I'm anticipating a lot of traffic on the whole wireless network.  Hoping not to get a ton of interference and lags.