Qouted from Afrihost
We do not use pre-defined download thresholds, so there is no "target" amount. Our QoS policy is implemented on the basis of available capacity, and not on set values.
We split our Uncapped user base into groups according to their usage patterns (not threshold totals) and this determines the degree to which their downloads receive priority. This is dynamically managed, though if the user does not move in between groups, the downloads speeds may appear constant. But there is no way to predict download speeds as they can potentially change at any given moment, based on available capacity.