The Kahler people like is the steeler and that is no bigger than a OFR.The theory is the metal is better quality and of course the Original is well, 'the Original' design thereby supporting the bzillions of units that have been made over time. Not sure I buy all that but there you have it.
The best sounding Floyd I have is actually a Kahler Floyd, too funny. It's honking big, more weight, more sustain, etc. I have one mid-80's Floyd on a Charvel Strathead as well.