The forward turbos are good yes, but it only takes one shot for the heavier cruisers to rotate and bring their extra firepower to bear. The Mon Cal is next in the research queue and a stronger ship in combat. That said the FRG is a good support ship when you do get the MC80, and very strong for the cost. A lot more cost-effective than the Carrack, definitely. I use them to lead smaller taskforces as well (eg in the outer rim systems) where bigger ships would be overkill or needed in the core. The A/FRG is the cheapest battlecruiser though, as its shields are rated at 600 and it has nearly the same firepower as the Mon Cal while costing less. Best capital ship (at least in bang for buck) in the game has to go to the Corellian Gunship though. Speed rating of 4, deadly to fighters and costs a measly 10 refined material - significantly cheaper than the Imperial L/FRG and Carrack. Very good for keeping those TIEs from damaging your starfighter wings.