The 60GB model is thicker than the 30GB model, which is ultra-thin. Doesn't matter to me, because I want more space and don't care about the size difference. If you are looking for something ultra-thin, and don't want to store lots of video, the 30GB model might work for you. It's also $100 less. I haven't heard anything about problems with one over the other. It's possible, however, because the drives are not identical (one platter in the 30GB model, versus two in the 6GB model), but I wouldn't worry about it. Get whichever one you think suits your needs.