I don't have the greatest internet connection in the world.
When the upload runs at maximum speed it not only decreases my download rate a lot, it also makes my entire internet connection extremely slow.
This means doing anything internet related, even just refreshing a webpage, extremely slow and basically unusable until the torrent has finished downloading.
I started out with 600kbs down, then it started uploading at my max out speed and now I have 150kbs down.
This is just silly, if I had any other choice I would not be using your torrent application.