I know the FDS isn't most players ship of choice and as some have alluded to, I would be smarter to buy a dedicated ship for each role. But I am just not the type of player that wants a fleet of ships where most sit idle 95% of the time, when I buy something I want to have uses for it.
Have you flown the FDS before? If not, the moment of truth is going to come when you take it to planetary ring and start drift turning around some asteroids. It's not the most optimized ship on paper, but if you love the drift and that sense of weight which comes with swinging that tail around, it can be terrific fun (which is more important than stats).
Funny thing, the FDS has recently become a "ship of choice" for a certain niche task: Thargoid hunting. A lot of people seem to swear by it. 4 class 2 slots to accomodate 4 AX weapons, a class 3 in the middle for a flak launcher, and crazy hull tanking potential higher than even the Gunship.