said by Ott_Cable :
I use QoS to reserve my upstream bandwidth for VoIP on cable.
I don't use it for the downstream as it basically throws away the extra speed I would have with Rogers Speedboost.
Since Rogers uses Speedboost for the first n MB of data, I figure that new VoIP connections should get the extra bandwidth anyways.
I wish the people that implemented QoS were a bit more smart to only turn the bandwidth limiting only during a VoIP session and not on all the time.