It is pointless the way they are doing it
Cox used to do it right, uncapping for the first few hundred MB of a DL but a few months ago they "fixed" it so that a 50Mb tier was capped to 55Mb with PB. Who would notice?
I'd love to have an uncapped 8 channel connection for the first say, 500MB. Even with a 150Mb tier that would turn a 30s download into 15s one. And I may even willing to pay a premium for it.