and quite a bloody nightmare to use it, esp overseas.
For the GO card, you can only use Mastercard for purchases of up to $2000, but only $1000 max in one go, hassle.
Overseas, some places do not honour the card, cos your numbers in front has no indents, so some acient machines cannot carbon copy your card. Some Mastercard portals cannot be used for payments as well.
Just think of it as a ATM card, your life will be much happier person.