Don't get me wrong, I love the hero-power. In my book, it's the single best Hero Power in the game, mainly due to it's synergy with Deadly Poison, Blade Flurry and the ability to save it.
The hard part is knowing when to attack, when to equip a new dagger, ect. New players tend to attack whenever they can, but that's wasting a lot of the powers potential. You could always draw a Deadly Poison the turn after, and you don't want to equip it on a weapon with 1 durability. Then again, you could draw an Assassin's Blade or a Perdition's Blade next turn. If you then choose to equip it, you are wasting damage. That 1 damage from attacking with your hero power instead of saving it could cost you the game.
I love and hate the rogue class for it. Wicked knife is one of the most complicated mechanics to master in this game.
Personally I feel like I'm saving my hits a bit too much, and end up wasting durability. Because of this, I have won several games with Deadly Poison, hit, Blade Flurry combos, but I've probably lost atleast as many due to missing that crucial 1 damage.
Thoughs? Tips? How do other Rogue-players manage their Hero Power?