I haven't, because they're in no way worth 5b credits.
That what I thought but was using. In current trip I decided just to park it and keep going alone. Couple jumps and I got to very low stars density where I had to use jumponium to pass it. Guess what? I called carrier I felt not comfortable without itI don't need one, it doesn't fit with my playstyle. Sure, it's useful for certain things, but if I go exploring, I don't want a huge anchor holding me back when I can travel a lot faster to get to the interesting regions.
With FC it's just different. Now I fly at 1500 below plane without detours. It's complete uncharted. 1 carrier jump distance scanned goes up-to 20 mils after my 33% fees are paid.Some people seem to have more time and/or are happy to relentlessly grind out the billions to get one (post-nerfs). I don't have the time but happy to get there at my own pace. Whether I actually NEED a FC is another matter though as exploration seems to be better and more efficient without one.
Oh, a question. If I did decide to splash out on a carrier, is more than one design available? I thought someone once said there were more than one, but I don't see details in the game.