The cap mod apparently varies in cap value from system to system and although ok for nutcases like us, it's not really good in the outside world, as there's no standard for amplifier input impedance.
The Gator mod enables the Caiman to be used with utter consistancy with a very wide variety of gear, now straight into power amps with longish interconnects should you wish. I'm sure someone will come along shortly with their own views on the sonic differences, but the Gator, IMO, upgrades the DAC for use in the real world
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me