I just upgraded my existing Road Runner turbo connection to their Business Class service and I now have 15Mbps downstream and 2 Mbps upstream along with QOS to give my packets priority over the rest of the regular Roadrunner customers.
Road Runner Turbo - Business Class bandwidth test
Prior to this upgrade, I was getting 15Mbps downstream and 1 Mbps upstream and so the extra Mbps of upstream is nice but I can really tell the difference in the QOS. I did a speed test to a server in Chicago and then to another server in San Francisco and didn't notice any drop in speed or overall bandwidth. Prior to business class Road Runner, there was significant drop-off in speed as you traveled further away from my location.