Terry has a great writeup on the CFFA3000 card in his IIGS, but I thought I would add that inside my Platinum IIe machines - it is amazing too. Load up a ton of .DSK files onto the root of a USB stick, connect it into a USB extension cable (which goes out the back from the card, around to the front for easy access). The CF card is faster, but the USB rolling around to the front of the machine is very easy to get to - and MUCH faster than a floppy (or even a Profile I suspect)
I have moved my floppy controller card down to slot 1, put the CFFA3000 into slot 7, and assigned the Disk II emulation to slot 6.
If you are *thinking* about the CFFA3000. Stop thinking. Go and order one NOW before they run out. I am very impressed. There is something similar for the ZX Spectrum - I'm going to order one right now. It changes the 8 bit computer experience! (Some say it isn't a pure experience - sure, I get it. But I just want to play the games too sometimes)
Right! I'm off to play every Apple II game ever made..... (ha!)