This is an item I have heard about in passing many times, but never paid much attention to, because at the time, I didn't see why I would want one. However the notion struck me that it would be a convenient means of transferring data via a hard drive from one computer to another, so I quickly looked at them on eBay. The thing that impressed me most, at first glance, is the price range difference...anywhere from a few dollars, up to $2,500. I can't imagine anyone choosing to pay that upper end price, but then again, I know so little about them, I don't know what one should expect to pay for a good and reliable unit? As said, all I would probably use it for is occasional data transfer via a standard sized SATA hard drive. Size isn't too much of a factor, since I wouldn't be traveling with it, but then I don't want something that takes up a lot of space for nothing. If someone would share their insights with me on this, it would help a lot. EDIT: Perhaps I should add to the question as to which type of interface would work the best in my situation? I only have USB 3 on one computer, so that would limit my choice to USB 2, should that be a critical factor. I could go ethernet, but I suspect that would be slower...don't know?