Cheers from me too Orkie - I'm setting myself up again with my old GP and couldn't find my cable.
As I remember it, with mac you absolutely needed one to format a SMC, with macgp32linker.
Can't beat the price either so I've ordered 2.
I'll tell you what, starting 'afresh' with the the GP32 is quite a fun little affair. I've always enjoyed installing and configuring emulators so this should give me few weeks of pleasure.