That is true that it is shared bandwidth, but I haven't seen anyone here complain that it has been a real issue since tech corner got started.
Nidan makes a good point that if you are constantly uploading huge files, that upload speed might be a consideration. But I telecommute 3-4 days a week and do email and file uploads. Plus both Chandler Mike and myself run these multi-megabyte vbulletin sites and applying upgrades really has not been a noticible problem.
Here is a place you can test your speed:
http://bandwidthplace.com/speedtest/
They say the average connection speed for cable in Phoenix is 1.93 Mbps which is still 30% better than DSL. I have a bunch of neighbors with cox internet in the neigborhood, and am sharing their bandwidth, but I'm doing almost 2x the DSL speed.