I have not yet received my card, I only ordered it yesterday. But I'm wondering if it's a bootable device? Can it boot into GSOS? How fast is it using a CF? How fast is it using a HD?
To answer your question, yes, the CFFA is a bootable device. For a IIgs, I believe one must have the slot that the CFFA resides in marked as "Your card" to be able to boot. I currently have ProDOS 2.0.3 booting on my ROM01 IIgs (off a hard drive) this way.
As for speed issues, I only have disk][ and Apple 3.5 floppy performance to test against, but it's blazingly fast in comparison.