Hi MWEB Guy,
My usage is high this month. 250GB+ the last time I checked (before I started this large HTTP download).
But yeah, considering that we've been told that usage is not a factor, and considering that the download that you see in my graphs is a simple HTTP (port 80) download, I sincerely hope that this doesn't turn out to be a result of my usage.
Besides, that still doesn't explain why my two friends in Cape Town who are ALSO sitting on 250GB+ this month are enjoying full speeds as I type this.
Edit: Yet another friend, this time based in Glenwood, Durban. Same experience as me. His usage is 50GB. I'm convinced this isn't usage-based, but rather routing-based, and the various bandwidth-shaping that goes with those different routes.