I just bought another one from amazon.com. I had the same sandisk a while back from buy.com for 79.95. Good buy. I don't have a low voltage card to compare if it's any better...but I haven't had a problem with these sandisk. I think I'm going to use one for movies and 1 for programs and mp3. When you start putting movies for the 770 it fills up real fast. Besides...I don't think they make a 1gig dual voltage rs-mmc yet so you're out of luck if you want to wait for those.