own you own modem be the smart way to go . Comcast be charge we $ 5 a month to rent one , it take just 8 month to save money with this modem . -lrb- this modem be on sale when I buy it -rrb- this be the most reliable cable modem I have ever use . I have have it for about two year now and it be still go strong . I can not think of the last time I have a network problem that be the fault of the modem . I do not even reset the modem anymore when have problem , since it be always the router . Pretty amazing for a refurbish modem . it be a shame Linksys brand router be not this dependable . if they be I would be a very happy camper . one downside : this modem use the aging docsis 2 standard , which do not support ipv6 . when isp start to roll out ipv6 you will not be able to take advantage of it with the cm100 . it do not matter at all for normal people because ipv6 support will not be \* require \* for many , many year , but if you be a techie like I and you want ipv6 asap , you be better off get a modem that support it .