The modem fritzed out today, and the service call to the cable company was actually tolerable and helpful. The agent suggested I buy a new modem myself and gave me model numbers for compatible modems. That way, I would save the $5/month rental charge, get a $3/month credit, and save the charge of the service visit. Oh yeah, and there's a Best Buy half a mile from my house, so I had it purchased and installed in 30 minutes. So thank you RCN, Motorola, and Best Buy. Have a great weekend everybody.