this cable modem increase download speed by 50 % and decrease ping latency from 13ms average to 10ms average ! the download speed also become more stable at around 1.2 mb\/sec . I highly recommend user of average isp supply cable modem to upgrade to this one ! I purchase this cable modem mainly because of the intermittent disconnection of Socal Time Warner Internet in my house located at Brea , CA . the original setup be comprise of a ASUS Black Diamond dual band wireless-n 600 router -lrb- rt-n56u -rrb- and a D-Link DCM-202 DOCSIS 2.0 USB\/Ethernet Cable Modem . before install the new Motorola sb6121 cable modem , the download\/upload speed be approximately 17\/1 mbp , and the internet connection be very unstable . I though that be cause by the newly install ASUS rt-n56u wireless router . I go through many official and unofficial discussion thread and review of the new ASUS router , which receive many very positive review , and I try to trouble-shoot the disconnection by myself without success . I also call and complain to Time Warner twice , and every time the issue be temporary solve by use only the D-Link modem . at this point , I start to doubt if the issue be cause by the original D-Link dcm-202 cable model . I contact Time Warner again to make a appointment for they to send a engineer here to check the signal quality of the exist cable . Ron come , check it , and find no problem . he then uninstall my D-Link dcm-202 modem and install a Ambit Cable Modem u10c018 without any extra charge . immediately after use the new Ambit cable modem , the disconnection issue be go and the ASUS router work really well afterward . the download speed also become more stable but not too much faster than D-Link DCM-202 . on the same day , two hour after Ambit cable modem be install , the Motorola sb6121 arrive . I decide to give it a try and call Time Warner to register my Motorola SB6121 Cable Modem . totally the process take almost a hour after my call be transfer three time . immediately I test the speed on speedtest.net . I be amaze by the initial number of the burst speed : 50mbp ! after test few more time , the speed be cap at around 27mbp stably ; that be still a huge improvement . I wish I have order this model earlier to save all those time waste to trouble shoot previous issue .