AfA is working great on my A2000 (screenshot
here). It does slow things down a bit, but it's still usable, and fun to have such a nice looking desktop an an old computer. My brother thought I was teasing him, running an emulated Amiga with a PC hidden behind the desk, LOL.
You can always revert back to normal by holding the left mouse button on startup... or setup additional OS partitions (what I do).