[kwlug-disc] Rogers Bandwith Limit - Consequences of exceeding?

[unsolicited]

Rogers site says on their website you can exceed your monthly 
bandwidth limit (different costs per GB exceeded, depending upon your 
plan), to a maximum of $25.00.

Poking about the web, it seems that at some point they significantly 
limit your bandwidth. I wonder if at some point they just cut you off. 
(Until your next monthly period begins.)

Anyone have hard experience with this / costs / limits / consequences?