Is not just a leechers tool. It can be set for unlimited uploads.
All it does is take away the relationship between uploads and downloads (like the PL I hear you say).
For someone who has limited upload say 128 kb even if they are on 600 kb download, it means that they can continue to share at their max. While getting the advantage of a faster download.
Since they cannot upload any faster anyway why is that a problem.
I am at a loss to understand why people have a problem with this.