Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't Buy this Modem!

This modem is NOT DOCSYS compliant and will NOT work with AT&T; cable service. 3Com Tech support, (which doesn't have a toll free number) describes a 'secret' web site that AT&T; can go to get a frimware upgrade that this modem requires. AT&T; tech support, after several calls and several technicians, all say that 3Com is giving me misinformation. Several people, in fact all that i spoke with at AT&T;, said that the 3Com modems are junk and strongly (yet unofficially) advise ANY other brand of cable modem. Some also added that 3Com's other network gear is no longer a qulity purchase.All told, I spent (money) on the modem, ... dollars calling tech support at 3Com, and (money) on a service visit from AT&T; to tell me that my 3Com modem doesnt work. On top of all of those costs, 3com wanted me to pay for the shipping to send it back for a refurbished modem. I cut my losses and purchased a Motorola instead.