All the cards we received are class 2. The thing that concerns us, perhaps more than the serials, is that the class 2 logo appears on the wrong part of the card. The SanDisk Class 2 cards pictured on the website all have their Class2 logos in the URH corner. The ones on this card are found on the LLH corner. That, plus barely fitting in the device raised concerns. I also had problems with the card in that SDHC readers (yes, it is certified as able to read SDHC). Also, the card would cause some writing applications to crash. It's entirely possible that the cards are from the manufacturer - to this end, I am sending it to SanDisk, who has offered to replace it. If they find the card to be non-genuine, I suppose they'll let us know. Nextweb, I'm not faulting you or your company, even if it does turn out to be non-genuine. If it can happen to us, it can happen to anyone. Either way, hopefully a properly-working card will find its way back here.