All I can tell you is that I got a
USB Drive and what my opinions are of it. At the same time, they seem to have modified their product a little, so this may no longer be accurate.
The keychain attachment they provide is this tiny, weak spring clip that died within days (literally) of keeping it in my pocket. I finally was able to force a small split ring through the tiny, tiny, hole provided, scarring up the body quite a bit along the way, and that seems to have held. (I went through a number of other possibilites before I came to this.)
The top, on the other hand, was an even bigger laugh. It was held on solely by the friction of a few vanes inside the top pressing against the USB plug. It would fall off if you looked at it funny. I finally had to dremel out those vanes, slice off the socket of the USB extension cable that they sent along with it, and epoxy it inside the top. It holds on very well now.
Not to mention that they sent me one with McAfee's logo on it for some reason.
The actual function seems very good. I've used it under Windows, Linux, Solaris, MacOS, and MacOS X with no non-standard drivers with no problem.