Since leaving National Bank (now ANZ), I have moved to Westpac for my regular credit card use. Westpac only offers AMEX + MasterCard.
I was at a shop today and was told that MasterCard fees is quite high... They are now charging 4% extra for MasterCard but none for Visa. They do not accept AMEX. If this is going to be the trend, I may need to start looking at other bank...
Article from Stuff today: Credit-card-surcharges-are-they-justified