Here is a good one, I still have the same service but now it seems I am getting the "Powerboost" that they offer on their Turbo level of service. It is a huge pump in your downstream for the first part of a download so you can finish it faster.
I am hitting near RR Turbo speeds on their regular service now on speedtest.net my ul is always right around the 512 it is supposed to be, so I know I am not on the Turbo level of service since they tout 768 ul speeds.