I hear you can get much better performance and reliability from purchase you own modem rather than the rental from you isp so I take the dive . I have have this model for about a year now and have have zero complaint . out of the box , I plug in my cable , about a 15 min phone call to Charter Communications to set it up on they end and I be up and run . I be sure there be setting and tweak you can do , but I have be use it with all it be default setting and it seem to work great . I have even notice about a 5-10mbps increase in my download rate . in the year I have own it , I have only ever have to restart it 3-4 time . once I think I be actually knock off , the other end up be a issue with my wireless and reset the modem as a precaution . I also love how small it be ! the dimension give in the description must be the size of the package box . in reality it be only about 5 '' square and a inch thick . I do not score any point for `` compatibility with Comcast '' since I do not use they as a provider .