it's like a extra torpedo weapon without giving up a front slot. Sure, you'll give up a turret, but that's such a puny weapon anyway.
A single turret does more overall damage than the cutting beam when your count in rapid fire and scatter volley. I did multiple tests to confirm exactly that, because I personally didn't want to believe it, I wanted to use the cutting beam.
If your intent is to use that cutting beam, it should be primarily because you want the 3 piece set bonus.