Has anyone used Comcast's new T1/PRI voice service with an Asterisk system?

I'm very interested in switching to Comcast's T1/PRI voice service for our office. They say that they have a 60-day satisfaction guarantee. But, I don't currently have a T1 interface card, so I'd have to purchase one to try it out.

I'd love to hear from anyone who has tried or is using this service with an Asterisk system.

Presuming that I do end up trying this out, I'd also like to have recommendations for single channel T1 interface cards for the Asterisk server.

- Brett