I have be look at this modem for a while . my search begin when my Linksys CM100 go out for half a week . I come to find out Comcast be work on the system -lrb- upgrade to DOCSIS 3.0 -rrb- which knock my modem off the network and it would not bring in a connection . I decide to buy this from a local retailer because I remember the difficulty I have to go through the last time I try to buy a modem from Amazon . it be not anything on Amazon 's end or the seller . I believe it be due to the modem be create for specific region . if the modem 's MAC do not start with a certain set of number then it will not work in that region . I wish I would have know that before I buy the cm100 online here , but I buy it locally and it be a decent modem that have a solid connection . it just could not handle the capability of DOCSIS 3.0 . unfortunately , Comcast never notify that the system have be switch to 3.0 so I be use a DOCSIS 2.0 modem Linksys cm100 on a 3.0 network . I keep wonder why my speed seem so different after that half week the modem go out . it be like the modem be be overpower or could not keep up with process . as for this modem , I can not say enough . it be easy to setup . I do not have to call Comcast to get it activate , unlike with the cm100 . all I do be plug up the connect for the coaxial , ethernet , and power . let it go through pull in activity light . plug the other end of the ethernet into the netbook I have . open a webpage and from there you just enter you account information and you isp will recognize it on the network . it will display info and ask if it have correctly identify you modem . you say yes and then it register it under you account . compare to my last experience with set up my own modem -lrb- linksys cm100 -rrb- this be heaven ! I see a significant improvement in my speed . it take I say a day or two for they to get to a consistent point . now I pull about 36-46 mbp download and about 4-5 .5 mbp on upload . for I that be a great improvement from get only 22-24 mpb download and about 2-2 .5 mbp on upload . and with both set of speed I just mention , I be on the same exact speed tier . now I feel like I be get my money 's worth of what I be pay for internet service . the way I come to choose this modem be by Comcast 's approve modem list in they support page for Xinfinity Internet . then research vigourously to find the best option out of the list . if you select you speed tier it will pull in a list of modem that be approve to use . this modem have a 3 star certification so for they standard -lrb- Comcast -rrb- its the best you can use for you service . so in summation I would say if you want to get the best out of you isp connection , especially if its with Comcast , I would go with this modem .