said by MJB:
enjoy reaching you cap faster
Do I need to say this every time? It's not because your files download faster that you'll necessarily download more. Or if most of your usage is streaming like Netflix, the added speed won't make the movies play faster, letting you watch more.
(Not defending the low caps, far from it - I'm moving to a third-party provider this month - but the whole faster speeds mean you reach your cap faster thing is not true for most people).