[saltman]

It depends on the size of the torrent I think. This is all feeling and I have no stats to back these comments up.

On larger torrents with 75 leeches, superseeding seems to slow down the first few leeches and makes the group catch up and finish more as a group. This will slow down the first completes but will also slow down everyone. On small torrents with 10 or less leeches, I think it helps. It seems to let everyone finish up quicker and not bunch up in a group.