Mweb doesn't completely block anything.... but they do shape it. Basically what happens is that during the day everything which is essential for business such as mail, web browsing etc. are given priority over things such as rapidshare and torrents. At night the priorities are removed. It really doesn't matter how much you've downloaded since Mweb will let you download as much as you can, or rather as much as the shaping allows.
What I would honestly suggest is that you get a service such as DownStorm or AreoVPS. It will allow you to download your torrents to their servers then you just grab it via a normal website download which is not going to be shaped like the torrents. It's a little bit more a month but it is well worth it if you want to download quite a bit.
Out of the whole bunch of them I'd say Mweb really offers value for money when it comes to uncapped packages. Unfortunately it takes a bit extra to get the most out of the package, but if you take for the same amount of money a few months ago you'd only have gotten a few GBs of bandwidth.
