There is a big difference between the current clutch setup and the one on our SEEG's. The master cylinders are different, and the clutch itself is different. The old clutch used a diaphragm spring and simple clutch pack, the new one uses coil springs and a system of ramps that supposedly allow the clutch to either slip on decel or increase pressure on the plates under heavy load (torque sensitive). Thus the name Assist & Slip.
In "theory" the six speed Cruise Drive should shift better and quieter than the old five speeds. They use shift rings instead of sliding heavy gears into and out of engagement. Less inertia should reduce the shock load and noise. That theory works for other companies like Baker btw. If you don't know what fluid is in the trans, I'd suggest you assume it's the motor oil that Harley installed in all three holes. Change the trans to a real gear lube, 75w90 for most climates, and you will likely feel and hear an improvement. There are many good synthetic gear lubes that will do a fine job, some examples are Spectro, Redline Shockproof Heavy, Bel-Ray, etc.
JMHO - Jerry