It's wonderful when using things like Ripper Beams (good damage, 20kt, crap range). Yank the enemy into range, shoot him up, knock him back out of range
With long-ranged weapons, a Repluser can keep the enemy out of their effective range or disrupt his fleet, letting you concentrate fire on one or two ships while taking less return fire (since his ships are knocked back).
Wormhole beams are fun too. Completely random movement.
he may move one space closer, he may end up in the opposite corner. Great for keeping pesky ships away from fighterless carriers.
Phoenix-D