Enjoyed using this stuff while nymphing on the San Juan. Very easy to work with and stuck well when placed above the knot, just make sure you dunk it in cold water to get it to harden up and set. Removal was easy and without leaving any kind of residue on the leader. Little bits go a long way.
ProsEase of use, stays put without being too sticky, quick way to add as much weight as you need.
ConsAs with all puttys, its difficult to judge just how much you're using. I found myself using too much far more often than too little. For really small amounts I think you're better off using minute size split shot due to your ability to more accurately gauge how much you're using. Not really a con, just the nature of the beast.