grape pressing

I was able to get this bladder press for $500 from Aliexpress. Its a 10.6 gallon 40 liter press. Has anyone used one? How many pounds of grapes can you press at once with it? Will it hold 200lbs?

I have a cab sauv in a 30 gallon Blichmann wineeasy and it's ready for pressing. I am going to use the piston press. Last time I used it the pomace was still pretty wet after pressing. Is there a tip for getting more from the pressing with the piston or should I just put the wet pomace in my...