I have to agree with the poster above that I use this so rarely that it is completely useless.
At first glance, it seems like it's useful. And... at lower teirs, it might be. Think about it...
You're raiding and suddenly... one of the warlocks, wizards, etc. manage to pull aggro. Before they can die, the swashbuckler quickly grabs aggro with his Sleight of Hand and then uses one of his aggro debuffs to get aggro back to the tank... thus... single-handedly saving the raid.
Sounds wonderful... the type of things bards sing songs about...
Here's what REALLY happens...
Warlock, wizard, etc. gains aggro from a T8 mob... they die... instantly and before the swashy realizes they even have aggro. OR... they gain aggro... and by time the swashy can find them in the raid list, let alone switch targets to them to grab aggro... they die... near instantly.
WE can barely take a hit from most T8 mobs and most finger-wagglers go down with very little fanfare. And we go down without much more.
T8 mobs hit hard and they hit fast. The chances and oppurtunities of this being a useful skill to us are so remote and so small as to make it completely useless skill.
Let's replace it with either a dps buff... a major debuff... or my favorite...
An ability like the brigands band of thugs that summons screaming women who run out and beat on the mob while yelling "Don't hurt our boyfriend!"