Rating: 
Summary: Excellent Price, Excellent Product
Review: ... If you have a rental cable modem from your high speed internet service provider (ISP), switching to the Motorola SB4200 is the way to go; the money saved by not paying for the rental will pay for the modem in 5 months. As other reviewers have also pointed out, installation is relatively simple and the Standby feature is a plus. You will need to call your ISP to give them the "MacID" when you switch to this modem and, obviously, return your rental cable modem.
Rating:
Summary: Just a great Cable Modem
Review: A cable modem should work in such a way that you never even know its there. This cable modem does exactly that. Some of Motorola's older models really [weren't good] and were constantly losing link with the cable provider. Not so with this little baby... it just keeps on chugging... even with a 40 watt subwoofer blasting beside it.
Rating:
Summary: OUTSTANDING
Review: After upgrading my older cable modem my downloads sped up from 25K/sec to speeds between 100K and 400 K/sec. Like going from an early 1970's 911 to a modern Porsche Turbo.
Rating: 
Summary: AVOID
Review: Avoid this product. It is the most troublesome modem I have ever run across. From the first day we had trouble. It took two hours to get the first computer connected to the cable modem. After this computer needed to be reformated (for unrelated reasons), we tried hooking it up to a second computer. Again, it took a couple hours. It said it couldn't establish a connection between the computer and the modem, despite the activity light flashing. After the original computer was reformated, the cable could not be connected to it again. We tried everything, even calling the techinicians several times. I was told that it was my ethernet port and that I needed a new one. I took the product back and got a Toshiba. The modem was hooked up no problem in 2 minutes. Avoid the Motorolla cable modem. Its absolutely horrible.
Rating:
Summary: Superb modem
Review: Before I bought the SB4200 I was renting a SB4100 from the cable company, AT&T Broadband. The SB4200 is slightly faster than the SB4100 and was very simple to set up. It has a great feature set: *Upgradeable to DOCIS 1.1 *USB and Ethernet support *Internal power converter, so there is no large power converter that has to plug into your power strip *High speed Bottom line:
This modem is worth every penny; and if you are renting a modem from your cable company, return it and buy your own (you will save money in the long run...the modem pays for itself in little more than a year!)
Rating:
Summary: Easy and complete
Review: Comes complete with USB and RJ45 cables. Needed to contact the cable company giving them the customer s/n and mac id numbers (easily identified on the box and extra stickers supplied for the unit and your documentation.) The modem does the negotiating and syncs itself. All you have to do is plug it in.
Rating:
Summary: Great for Cox Jockies
Review: Delighted with Motorola SB4200 on my Cox cable service. Like the DOCSIS upgradability. But do check out Circuit City first.
Rating:
Summary: Works Flawlessly w/ various O/S's
Review: Got this modem over two years ago, and have not had a problem with it in those two years. It's been up and running for most all of those two years (save power outages).
Took me about 5 minutes to install, including unpacking it and connecting it to my Linksys wireless router.
It's worth noting that I primarilly use Linux, and it works just fine in that environment (it also works just fine under BSD and Solaris). Other family members use Windows (God only knows why), and have not had problems.
Above all else, this modem will QUICKLY save you money over your local cable company's lease rates (five dollars per month for an obsolete sharkfin model with Charter Communications in St. Louis). Well worth the purchase!
Rating:
Summary: best cable modem ever
Review: Had no problem getting it running at all. Really really fast, I got up to 8500 kbps (with optimum online, of course). The standby feature is a great way of not losing your ip address. If yer getting a cable modem get this one and just stick it behind your monitor.
Rating: 
Summary: Works but no rebate check
Review: I bought the modem to replace the RCA modem that comes from attbi so my monthly service charge is reduced. It works without a glitch after plugging in. Motorola had a rebate offer advertised on this model; the rebate check never come after sending in receipt and clip of upc on box. I guess that went with the down sizing...
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