unknown to I , my comcast-issue atlanta-scientific modem -lrb- for the use of which I be pay Comcast every month -rrb- be apparently the source of the ridiculously slow and painfully inconsistent connection speed we have be get . one speed test would come in at 10mbp , and the next at 600kbp . usually it would come in at 1.2 to 2.5 mbp - a mere fraction of the bandwidth for which we be pay . after a little online research , I decide to just try buy my own modem - it certainly be not go to make the problem any worse . the worst part of the entire process be just be on hold with Comcast for 15 minute . once they get to I in the phone queue , it take about 5 minute to get the new modem up and run . but whoa ! what a difference it make ! the day before installation , we get we typically inconsistent speedtest with a mean of about 2 mbp . as soon as the new modem be up and run , we test at 21 mbp , and there have be no fluctuation since . every speed test report 21mbp . wow ! what a improvement ! Skype video have go from frustratingly slow and pixilated with lousy audio , to crystal clear and clean . file download in a flash . and the connection speed seem to be very stable . if you old modem be let you down , do not hesitate to buy one of these . no ill can come of it .