I once had an A.T. Cross Radiance in marble green. It was the absolute best writing experience I've ever had. It was unfailingly smooth, its line had perfectly consistent width and never pooled at the ends of strokes, and it felt wonderful in the hand. It came with a piston, which I used after the starter cartridge ran out. I thought that was the niftiest thing. Of course I lost the damned thing somewhere in the halls at school. Either somebody knew on sight it was worth a lot (c'mon, it had gold plating all over it), or else somebody who knew I had it and who didn't like me (I wasn't very popular in middle school) recognized it and picked it up and kept it out of spite.
My Pilot Metal Falcons have the larger CON-70 converter that holds more ink than standard converters; less fill-ups.