I buy a refurbish Linksys cm100 because my isp decide to go up on the rental even for modem already install , which make no sense whatsoever as they have already purchase the modem and there be no associated monthly expense other than a occasional replacement , just pure profit for they . for six month ' rental I could buy this refurb , so I do . I hope everyone do the same thing and `` stick it to the man '' as young people say these day . my only real complaint about the modem be the same as with other similar modem : no power switch so you have to unplug it to turn it off and the led be very bright at night and I find that annoy . as far as minor issue , the enclosed disc be not for OSX , only Windows -lrb- not that it be need -rrb- and the MAC address be print so small that I have to use a magnifying glass and a bright light to read it . if you do not get the MAC address right when you call you isp , it will not work at all . as a tip , the letter be slightly taller than the number so it be easy to tell a 0 from a o -- with the magnifying glass . the packing be secure with the component in a pulpboard tray inside two cardboard box . it actually look new and if it have not say on the package it be a refurb , I would not have know . the cable provide be new , not sure about the power supply , look new but who know . aesthetically , it have a small footprint and no extraneous design feature , which I appreciate . my isp 's tech support have some difficulty get I online with the new modem but it be all they fault and have nothing to do with the modem itself . at first he say the problem must be with the modem but I insist that he double check and he `` run diagnostic '' and keep I on hold for fifteen minute and then all be well after a restart of the modem and the computer . I do not make he explain what the problem be since I be just glad the problem be resolve and I have waste enough time . the entire call last exactly sixty minute ! a speed test show I be get the full speed subscribe to so no complaint on that -- it work just fine . before purchase this modem I do talk with my isp tech support to confirm it be compatible . they be switch over to DOCSIS 3.0 for higher speed but he say for anything under 10 mbp , DOCSIS 2.0 would continue to work fine indefinitely . still , check with you isp to be sure . my provider be RCN and they do not list this modem but he say any DOCSIS 2.0 modem would be fine . I be careful to purchase from a dealer who offer a seven day return as many seller force you to deal with Linksys for warranty issue even if it be DOA . I do suspect that many people who complain on the internet that these refurb do not work just have a problem on the isp end like what I go through . in the end , though , for the price of a new one you could easily buy two refurb so what do you have to lose ?