I read all the posting on the Motorola sb6121 and decide to give it a shot . I be pleasantly surprise . I call my Comcast technical help and they get my MAC address instead of the S\/N id as state in some other post . within a minute I be online . unless there be something out there that be go to jump at I later , I believe this be a great product and worth the money . it work very well with my Medialink Wireless-N Router .