It's an AVCHD cam... it really doesn't need extreme anything, just get a name brand class 10 from a reliable vendor and you'll probably be good. Dual record if you're worried. I've used the same batch of Transcend cards in AVCHD cams for the past 5 years, with some turnover as I've shipped off media to editors. Only problem was with a card that took a trip through the washer.