Work great, easy to format. Problem is that Olympus and Sony accessories, such as memory cards are specialized and difficult to find if you don't live in a metropolitan area with lots of places selling camera supplies. Almost as difficult as finding camera film is today. Fairly fast, but a little more expensive than general use SD cards. Give them an A for quality, but only a B+ for being readily available in places like Walmart, which is supposed to have them, but rarely keep stock in anything you need to get your hands on today! And access to taking photos impromptu is important to a photographer. We need film, memory cards and batteries for cameras NOW, not a week from now, as is required if you order online.