I receive the package yesterday and have this modem work inside of 20 minute . I simply unhook my old modem and follow the step to hook this one up . I run the installation guide cd and when I be do it display the ` Mac '' address , tell I that Comcast will need it and direct I to call they for activation . after the usual 10 minute of they try to get I to NOT talk to a real person I finally get someone on the line who ask I for the Mac address and boom everything work perfectly . I then plug the Ethernet cable back into my wireless router and the three lap top , a couple of Roku 's , a Blu Ray player and the wireless printer all work great . I be not one to constantly check download speed but I be get some download interruption with the last modem so I want to replace it with a newer model . Time will tell but so far I be very pleased with this item and for the price it be a super deal . for my application this get 5 star Amazon be incredible but you need to be on you toe . I have this item in my cart and be ready to purchase it for $ 54.49 . somehow I delete it from my cart and run a new search and come up with this exact same item in a so-called environmentally safe box for $ 29.00 . there must be a catch . I have momentary buyer 's remorse when I be wait on the line with Comcast but absolutely not a issue . no catch and I save $ 25 . remember this be a 2.0 DOCSIS modem not the 3.0 high speed one . I do not pay Comcast for they high speed internet service and my research say I do not need the 3.0 for the level of service that I have with they . so for about $ 30 you can own you own cable modem , eliminate the monthly rental fee and pay this off in about three or four month . March 23rd update-i notice that the price have go up from $ 29 to $ 44.99 since I buy this -- now only $ 10 savings