Well, alright since i have been only using slasher for sometime now and needed to try his other stuff.Nope. If you're gonna go with Unstoppable, you might as well just use Relentless. At least you still get Killing Machine (dd4) and you have access to Dark Pursuit (dd3).
The "perks" of using Unstoppable are useless. His dd3 and dd4 are all pretty effin' bad and don't bring much of anything (if anything at all) to the table.