Alright, so I tested them, and what I can say is: The Abante and Orion didn't stand a chance against the stock KM ambassador. The Orion turns slower than i would expect. The Excelsior, however, did reasonably well against the Ambassador. They all got torn a new hole by Wiley's newest Nemesis Sovvy, though. 
Also, the Abante uses stock game torps, and I thought that a ship with that sophisticated of a look, would use better torps, such as Quantums, or even a better looking photon. The Excelsior uses Photons as the pulse, and I would have thought that it would have Quantums. I do love the look of the ships, though. They are gorgeous.