aramis erak
Legend
I remember getting a very, very bad impression of FASERIP from the Gamma World version.
The Gamma World version has a different granularity than the MSH/AMSH one. Some loved it, some hated it, and it broke the AD&D compatibility for that edition/
Same granularity issue for Zebulon's Guide for SFAD; further, ZG lacked the skills for SFKH.
Conan, MSH and AMSH worked rather well. Conan well enough that there's a retroclone of it: ZeFRS. MSH/AMSH is retrocloned with FASERIP.