I keep this set on my rogue for fun duels. It's funny when people are stuck in a 10-sec root (for melee classes I can often get re-stealths off of it haha).

It should also be noted that -- unlike other old items with cool chance-on-hit effects -- this set's proc doesn't appear to scale down with level. I think it has something to do with the fact it's a set bonus rather than a chance-on-hit effect as the poison and attack speed procs happen far less frequently.