It seems best to use on troops with a disruption role. Stuff you don't count on to win games. I'd be very wary of Deep Striking Crisis Suits, for example, since they're linchpins of the army and need to get stuck in as early as possible. A Gun Drone Squadron on the other hand, is a fine candidate. By the time they arrive the enemy will have advanced, so you deep strike behind them, open fire, and the enemy is forced to choose between turning around to despatch them (disruption successful) or ignore them and risk pinning tests (for continuous disruption). And if they don't turn up, or mishap, then it's not the end of the world.
Of course, mine is a Tau perspective, where we have low priority units that can deep strike. Other armies might not be able to afford such a cavalier approach.