I took down 2 bombers with it. Help did come near the end, but by then both bombers had already lost all weapons except their Supernovas and Nuc mines.. I've also killed a few Corsair GBs with it. Also, it fits much better than the old Rogue GB in terms of looks. All I'd suggest is SLIGHTLY increase the strafe speed, everything else is fine.
But no Doom, it can't beat cruisers, except the occasional Liberty Cruiser and stupid people who can't fly their Huntresses. And it SHOULDN'T. This is directed to you Lancer. Just because you could do it before (old Rogue GB was too good), doesn't mean you should still be able to. Thats why the current Rogue GB isn't as good as the old, and the BHG GB had some stats nerfed.