I have also heard many warnings about TL. My seedbox provider actually started publishing warnings to users suggesting they avoid TL due to heavy monitoring...
Notice from Xirvik:
2012-02-24 - Torrentleech
In the past week torrentleech made the top 3 of monitored-by-3rd-parties trackers (by our own metering). Please act accordingly, particularly if either you or your server in the US.