I'm using EIDE99 with vamp in my A2000. Works fine with AllegroCDFS. Speed seems acceptable. Haven't run any benchmark yet. Trying to solve why Xsurf100 refuses to work. But I don't think it has anything to do with EIDE.
Very useful to know!! I was thinking about getting one so that I can remove my scsi card.
As for Xsurf100. I have my A2065 working with vampire so at least in theory an ethernet solution can work. note: I am using AmiTCP. There was some work be done to make a Ethernet adapter for the microSD slot. At least on youtube you can see it work, but not have seen anyone selling the adapters. This might be a long term good solution in lieu of the Xsurf.
Additional cards I have tested, A2386, IVS Trumpcard pro, and A2058 with without any problems. I have not tested any of the more exotic cards.