Mint, for what it's worth I'm midway BGS mod 2, and to be honest, although I do have a home pc and the CD is excellent when I've looked at it, I can honestly say that I hardly used it in mod 1 preferring just solid bookwork and got decent first time passes.
I guess that's just my preferred learning style. It is a good CD, with some useful animations to put some things in clearer perspective but I would say that their conventional study material is of such a good standard anyway that I would question whether it was imperative to fork out for a pc just for that use.
But I do hasten to add what suits one, doesn't suit all, others may swear by it.