As most Comcast users are aware, since the "upgrade" - many people are getting worse speeds then prior to the upgrade. I upgraded to "Gold" for the 6 mbps down / 768 kbps up. I am getting the up speeds, but the down speeds are jumping from 1.5 to 4.5
I have been using various testing sites - and although all are inaccurate, the best I have found is: