I have SBC here in Modesto, Calif around 80+ miles dead east of the Silicon Valley. Overall except for the cost now of $49.95 I am very happy with it. I have had a few disconnect problems but no where as bad as Lizzy. Some of it was the old Router, now with the newer Linksys or Netgear I can go 2 months without it dropping and then sometimes it dumps every 2 weeks but that is rare. I can tell when it's the router of just the modem resetting. The worst problem for me is the IP changing and for $49 it would be nice of them to give me a fixed IP but they are not that nice!! I get 1.3Mbits down and 256K up.
Overall I am very pleased with SBC here. Stays up most of the time and has been quite reliable.
Lizzy, it could be your modem, seen that with other people. I have 2 Spares here, too bad you are so far away or I would loan you one.
We have Comcast here too, my friends that use it probably have more connection problems then I do and at least with the Comcast people here, they are not very helpfull or not very nice to deal with either. If you get a GOOD tech, SBC can be very helpfull but most that I have talked to were total Idiots trying to blame MY end for their Web Email not working when I can go to any other site on the net and it clearly saying it was their Emai server that was down! I freeked her out, She asked what computer and OS I was running? I told her the truth, Which one? I have 12! hahahhaha.. XP, 2k, 98, Suse Linux, Slackware Linux, Mac OSX, Mac OS9. I had her so freeked out she could not talk!