IG has a CC problem? You lose a cheap unit, break and shoot down what assaulted you. What's the problem? The least of my problems is getting assaulted, half the time it gives me an advantage.
Agreed with both of the above. If your opponent has a nasty CC unit heading towards you, leave a convenient, easy-to-charge unit about as bait. Enemy assaults, you lose a bunch of guardsmen, they run away or are wiped out, enemy unit is stuck in the open facing a wall of lasguns, heavy flamers on chimeras, and russes.
Work against everything from banshees to terminators.
Last game I played I left a 20 man combined squad in some terrain, but easily assaultable against an eldar player. Let him get close (except for the wave serpent carrying the firedragons and the two wraithlords, those I shot at a lot.).
Bansees with exarch, farseer, and even a phoenix lord rush in (granted I got lucky with the eldar player being an idiot). Predictably the guardsmen were wiped out, leaving 2 squads of eldar in the open.
They died next turn to a hail of melta, plasma, and heavy flamer fire. Eldar player concedes the game at the end of turn 3.