I've got an ACARD on my CSPPC actually. Yes its fast, yes I can run an SSD with it too, but you still need to buy one ACARD at nearly $100 each for every single device you want to use. It adds up fast.
This isnt that much money to try, and if I decide its not worth the hit I can resell it. I have a 75MHZ 060 and a 420Mhz PPC on mine, not going to notice a hit on my system.