That's the point I tried to get across earlier this year when I discovered how annoying Afrihost's shaping system is. With MWEB, you at least know what the limit is, based on your line speed, and can download accordingly, at full speed, until that limit is reached. At times I found I could surpass that limit by quite a large amount and still not be throttled.
Afrihost boasts about not having throttling, but rather shaping. That's great, but the shaping should use the same system as MWEB's. Right now, after a few months of downloading amounts that are even less than what I used to do with MWEB, I am classed as a power user and am shaped every month at the same amount (25% download and 6.5% P2P) regardless of my usage, because of my "heavy downloading history" (which I don't consider heavy at all). And there's seemingly no way to get away from that.
With MWEB, you at least started each month with a clean slate, with downloads running at full speed from the 1st and continuing to do so until you reached that ceiling again. If you didn't, full speed all the time, for everything. With Afrihost, today, at 2.30am, I couldn't dowload a torrent at faster than 5kB/s because I downloaded 200GB on my 2MB line 5 months ago.