I've just bought a BigRAM for a customer. It seems to work very well so far! I too wondered about the difference, and thought that the main difference was that the ZorRAM was supported by AmigaOS 4.1 - however, when I received the BigRAM, that says it is also supported by AOS4 the same way! It also says it doesn't like 3rd party bus-boards, but I believe the same is for the ZorRAM.
So, all in all... I'm not sure there is a difference except the price (Which must be really annoying for AmigaKit!)
