The title says it all, so lets launch right into it.
Note: Over time Xfinity's Hotspot may require that you re-login. To do this change the airports settings back to bridge, and follow steps 7-11 again. Also remember the performance you get depends on how far away you are from the hotspot and what kinds of networks are around you that could cause interference.
Comment here if this worked for you and how it performs! We use this in our office and have had great performance.
We're some guys and gals in San Francisco who fix macs. We can remote in and help you with stuff. It's like our job or whatever.