hmm, ever sat in one? Compare it to a Lear or a CJ and youŽll find way more headroom and me likes the flat floor very much. IŽd also like to point out the big door, compare that to the real strangely formed and small Citation door.
I never flew the 300/400/400A but evaluated it for our business, we had a Premier on order with the enormous delay the boss got imptient, in the end we bought a CJ2 which was a better fit to the KingAirB200 we operated also and could go way more places than the 400A. (rwy perf)
One key point was the relatively bad resale value. The CJ2 proofed to be absolutely great in that respect, we sold it after almost 1200 hrs for almost the same money we bought it (that would be different today, I know...)