I remember a while back there were lots of complaints about CF cards in 2 pks having lots of issues. Single card purchases were seemingly okay. I don't remember which Sandisk model(s) it was other than being CF cards. Are there still issues with the 2pks? Found some 2 pks with significant savings and was curious before buying. I'm looking at either the Extreme III (45mbs) or the Extreme's (60mbs) cards.