jabulon is exactly right, superseed has nothing to do with speed, it only helps during the initial seeding period, avoiding the same chunk to be uploaded more than once by the seeder. Especially if the seeder is considerably slower than a bunch out of the group of leechers, superseed mode can be of great benefit.
But .... leechers with uTorrent clients version 2.0 and higher are
not able to establish a working connection to seeders in superseed-mode by themselves, it only works for these clients if the connection is established by the seeder. Older uTorrent versions work fine, as well as all versions of Azureus, Transmission, Mainline and many more.
This has been mentioned several times at uTorrent board as an issue and is met with ignorance since more than a year. Majority of people are using uTorrent 2.x, implications are obvious.
A little boring video which demonstrates above
http://www.youtube.com/watch?v=x22vuFZrfMc
The letter "R" in the column "T" stand for "connection established by the leecher"
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