I don't pull the Fools Rush In maneuver too often....mainly because that Pause button is just so darn helpful. It seemed to work with the Demonknight, though (after some initial dance moves). I always Haste before the big fights, after my 3rd assault on the top floor of the Iron Throne (Man, that was beautiful.
), but I very rarely say, "Uh, go kill those guys!" and sit back to watch the fur fly. It's more fun (for me) to play the subtle assassination route, as I really know how to use my Thieves.
------------------
Boots of Stealth: 1125 gp
Shadow Armor: 7875 gp
Slipping an Oil of Firey Burning down the back of Sarevok's armor: Priceless