Rating: 
Summary: Poor speed
Review: Unlike the rest of the reviews, I did not have the same "Blazing speed" experience. I normally get 1.5 mps, but the SB4200 only outputed a meager 0.5mps. Not sure why. In any case, I'm returning it back to Amazon. The installation is very simple, and the modem seems to be of solid build quality. If it works for you, its definitely a winner. But, you do run the risk of returning it back if it doesn't work out.
Rating: 
Summary: Rock Solid Little Beauty
Review: When our original cable modem died, Time Warner (our cable/broadband provider) replaced it with the SB4200. Unlike others, we never had to pay a monthly rental fee on our cable modem, but getting the SB4200 was definitely a step up from the unit we had before. In fact, it was the unit we were considering purchasing when we thought all the cable company would do is replace our existing unit with an identical make/model. All of our lost connection problems and modem retraining failures were ended when the tech activated our SB4200. It went in without a hitch, and our network's a fairly complex (for a suburban home) setup with 2 wired PC desktops, 1 wireless PC desktop, 1 WAP (Wireless Access Point), 1 wireless laptop (a Mac G4 Powerbook with an Airport card) and a Linksys 4 port wired router. I especially like the modem's standby button, although we neglect to activate it routinely so we miss out on any additional network security it might provide.
Rating: 
Summary: Better than renting, working fine on Comcast HSI
Review: With the recent rebate offer for this modem, the cost was right for me to finally stop renting my cable modem from the cable company (an older RCA model), and save the monthly rental fee. I got the modem, looked at the documentation on the CD that came with it (there really should have been some more printed documentation in the package), and verified how I'd connect everything together. My scenario is that I mostly play around on the PC on the second floor to do surfing and personal e-mail, etc, but my home office PC is in the basement on the opposite side of the house, and that's where I have the cable modem physically connected. The Home Office PC has an ethernet connection to a Panasonic Gateway (KX-HGW200) which in turn is connected to the cable modem. The gateway is used to network to my 'fun'/personal PC on the second floor through HomePNA (home phone networking adapter) so that I didn't have to wire Cat5 cabling throughout the house. Since I'd been running this 'home network' configuration for the past year, I know its a stable way of sharing my cable modem access, and all I had to do was unplug my old rented RCA modem, and swap it with my new Motorola modem. Once that was done, I wrote down the MAC ID (written on the label on the back of the Motorola modem), and called Comcast to tell them I had replaced the rental modem with my newly purchased modem. I gave them the make, model and serial number of my new modem (they only use the serial number to enter into their system so that they can see that you no longer have a serial number from a rental modem on your account), then I gave them my new MAC id (the physical id of the new modem). After being on hold for a bit, they came back on the line and said I was all set. I re-powered the modem, then after a minute I reset the Panasonic Gateway, and I opened a new browser window on the PC upstairs (through the Home PNA network) and I was surfing the internet with no problems. I did a speed test, and everything is working fine. I was at about 1400Kbps receiving.
BTW, don't expect that by replacing an older rental modem you are going to increase your bandwidth/speed. Your connection speed will basically be the same (which is why I ran the speed test, to ensure nothing had gone wrong), but the purpose for buying the modem is that after a while you will re-coup your purchase cost and start saving money because you won't be paying a monthly rental fee for the modem.
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