Yeah. In a recent combat between the my PC's and an invisible creature, it's invisibility becamce a bit less of an issue once the PC's managed to put a few bolts in to the other creature.
THey still had to roll the 50% for concealment, but guessing which square the creature was in became easier once they could aim for the bolts and throwing axes. I gave them a decent DC for the bolts, since they are a bit small, but the axes were easier to spot.