Amazon : shipping be fast and free . Modem : it work great with Comcast in Chicago . I buy the ubee modem instead of the Motorola sb6121 or sb6120 because of the negative review the Motorola modem receive on Amazon . it take I 30 minute on the phone with Comcast to get the ubee modem connect . I save $ 30 with self-installation . the internet be very fast with the ubee .