I am really confused, why are their two different MFFS mods. Which seem to be wholly incompatible, yet offer a large amount of similar features.
Immibis ported this mod to bukkit while it was still in version 1. There was no bukkit version at that time.
Right after that the original modmaker (ThunderDark) released version 2, WITH bukkit support (with some help from Immibis IIRC)
Some people like the old system where upgrades are blocks and not items better I guess?