I've only just had a chance to use Misdirect in a game, and found the power to be a bit too strong.
I saw a sentry walking a wall above me, and used Misdirect to become undetectable to him, then committed my Force dice to Duration to maintain my stealth.
When I got to the top of the wall, his partner noticed me, and he noticed a sound as I stepped on some debris, but he couldn't see me. I shot his partner, and he noticed the blaster bolt, but still couldn't see me .
What do you do in that situation? We don't have the rules of breaking invisibility that the spell comes with in D&D/Pathfinder, and it seems a bit much for someone to be able to engage in combat and still remain invisible. In this case, I suggested to the GM that I roll a Deception vs. the sentry's Vigilance (the power uses this same check for its illusions).
What do all of you think? How do you play this?