10 million re-buy ? Expensive ? I ... guess.. <looks at re-buy for 700+million Corvette currently stomping around a CZ>.
The FDL kills quicker then a Vulture. It's a true killing machine. Much as I like the Vulture, the FDL out classes it in a one-on-one fight. That being said, the FDL is HOT. Not in the sense that it's "Cool to own", more in the sense that it runs HOT. Very hot. The builds I tried weren't sustainable for long term combat and depended on ammo to keep the heat down. It was either ammo based builds, or heat sinks which pretty much amounted to the same thing. It works VERY well for the PvPers or gankers who fight one or two ships and then re-dock. But if you want to loiter all day at a Haz-RES or CZ ? Hmmmm.. not so much. You'll spend half your time running back and forth to the station.
For a CZ ? I found a dual laser Vulture worked better. No heat issues, and with some RNGineering to cure the power issues, jump range, and speed issues, it worked very well. Sure, you sacrificed 'killing speed' for 'time on target', but you could stay all day. It worked very well. BUT, being a small ship it couldn't take a beating once the shields were down. So you had to know when to 'leg it' when things got uncomfortable. I spent lots of time at CZs in my Vulture. It worked even better when I figured out how to stay with my group of friendlies.
But even better was my combat Python. More lasers, and I could add a few MCs for the times I needed them : Once the shields on a big target were down or I was engaging a wing and needed to dispatch one quick. It had ammo based weapons, but I could choose when to use them. It was big enough to live thru a few mistakes or a pack of "rail eagles". Good shields. Power to spare for SCBs, SBs, Beam lasers, big screen TV, hot tub, indoor skating rink...Oh, and a frozen yogurt machine. The Python is the "make-it or break-it" ship for most. If you can make it in one of them, you'll be in one of the Big 3 and a billionaire soon. At that point, 10/20 million here or there isn't a big deal.
To sum up :
One on One and BH'ing : FDL is great.
CZ : Vulture is better choice. But even better is a Python.