You sacrifice a unit for a 8 second of stun? Great idea...
But to sacrafice a unit that will die anyway to destroy the engine AND main weapon of e.g. a Panther so it can be taken out by anything else is a great idea?
But 1 squad getting gibbed + a full retreat for 240 munis seems pretty fair to me.
Pay 240 muni to erase a vet 3 PG squad with Schrecks for 120 muni + full retreat seems fair to you? I'd take this ability event without the retreat bonus, 240mun vs 360MP/120mun (and maybe even vet3) is awesome (especially with all the mun you have as a soviet player, at least I always have several 100 available).