You guys keep leaving out the part about MorphOS 2.0 being really sketchy on the Efika.
I have still yet to get mine running stable at all. I dont seem to very alone in this department as well.
Its awesome when it runs but, I would not reccomend it to anyone right now as main "amiga replacement" at the moment.
Maybe 2.1 will fix it. I'm in a waiting pattern right now.
As far as OS4 goes, I gave up thoughts about trying to run that along time ago. I didnt have the $ to shell out for an Amiga One back then, and I dont have it now.