Superb. About the size of a false nail, with all that storage!
I have installed Linux to one, and use it as the ultimate portable computer - go to any PC, plug in the memory card (which I keep on my keyring) connect my phone, and get working. When you're done, power off, remove the card, switch the PC back on and it starts up as Windows. Nothing has been written to the hard drive of the host PC, so there is no chance that your browsing history can be looked at later, either by the owner of the host PC or any malicious software running on it.
This has to be the ultimate in security if you don't want to carry your own laptop around.
I can't think of a single fault with this item, and considering you can buy one for less than a fiver, it's a bargain.