FDL flies almost identically to the Viper. Turn rate, acceleration, top speed, boost speed... It's pretty much the same. But, with twice the class 2 weapons and that Huge mount, you can do a lot of damage with it, and it shield tanks better than anything but the Conda. On paper anyway. In practice, the Python actually seems to take more shield damage, even though it's officially got fewer Megajoules in the shields. Not sure why. The first time I flew an FDL, I said, "Super Viper!"
It's a very tricky ship. Powerful, but easier to get beat than you'd think.
Edit: Don't count on doing what the previous poster said and one-shotting an Anaconda's powerplant. You do have to get through the shields first, and class 2 lasers are not the best for that, and besides that, hitting that powerplant square-on is really, really hard. I've done it a few times... but it always took me two square hits with that PA, not one. You seem to do about 60% damage per direct hit. Maybe there's some kind of rare 'critical hit' you can get that will one-shot it, but it must take more luck than I ever had; there's no way to guarantee it.
Also note: when 1.4 comes out, destroying the power plant will have only a small chance of destroying the ship, and it will otherwise function like any other system...