In Live this weapon is still a wonderful damage boost during your Rogue's burn cycle.
Before you mash the big button hitting all your stacking Discs/AA/Abilities make sure you hit this first. As soon as it finishes 'casting' mash your BURN and watch the pretty numbers scroll by, then just reuse on cooldown (every 3mins with 2min duration. When it comes time for another hard burn it will already be running at the 10min mark in time to hit your big burn again: Frenzied Stabbing - Rogue's Fury - BP click - Rake's Rampage - Foolish Mark (2nd round). Delay Spire a minute and you should get the last of it in time for the beginning of the Burn. Hit Composite Weapon, Pinpoint Defects, and Shadow's Flanking on cooldown. I set most all these abilities to Hotbar 9 and set each button on that bar to my Z key so they all go off at once.
Enjoy your burns!