I've tried out p.os prerelease years ago.
For me it was a kind of WB-replacement and compatible with all applications i had.
it was named pre-release, because the final release should be released later on and be available fopr different ahrdware architectures. once i googled p.os, because i liked the icos so much. i found a company who has drwan the icons for p.os. But now i cant find that page anymore.
the p.os article on wikipedia was removed. it seems that prodad is running pos on their casablanca systems, etc. threfor a final version must exist ;o)
regards
mk68060