Pros
Heavily discounted cable and internet (I pay $28 for 2 DVRs and Blast Internet). Good health benefits and 401k matching. Vacation even for part time. Really great training pay. $16/hr while training. Provides a good "foot in the door" if you're trying to get into the industry. They hire within and have a really diverse workforce.
Cons
Being a sales consultant in the retail space is incredibly stressful. People come in pissed off, usually in the right, and you have to deal with it. You can't transfer them, "accidentally" get disconnected, or hand them off to a manager. You have to sit there and take it. Further more you're expected to try and sell products to these pissed off customers. Sales goals are incredibly high, especially considering most of our job is equipment returns and pissed off customers who don't want to be on hold or transferred. The new commission structure is confusing and seems to benefit Comcast more than it does employees. Management is constantly in the back office on conference calls for 4+ hours a day. They're never on the floor and expect you to handle customer escalations. Comcast does not value employees and you'll find that in sales people don't usually last longer than a few years.