OK, I purchased this item last week, and I must say I am VERY impressed by it. I own several Verbatim 512 usb drives, a Sony 2gb usb drive, a Lexar 2 gb drive, and some smaller office usb drives (8 usb drives in total) and I must say this Imation drive is the best of all of these.
As to the comment made by the reviewer before about this drive being slow, this is simply not true. If you have a USB 2.0 capable system (newer to semi-newer system have by default) than this drive is actually very fast. I put over 3GB of software on my drive (THREE GIGABYTE!) and did this in less than 30 minutes, and that includes the time of me selecting the files I wanted to load on this! And my software folder on there alone has 1192 individual files in it! So to say this drive is slow, I can only say that there is something wrong with your system if it appears slow.
(Keep in mind, there is a difference between loading a few large files, and many little files; it will take longer to load numerous files than it does to load large files in small numbers. So if you're uploading 4311 small files equaling 1 gb to your drive, it takes longer than uploading 100 files that equal 1gb in size. But this is true for all usb drives and also for hard drives, and if any performance loss occurs because of this, it is in no way particular to this drive.)
Furthermore, from my experience with other usb flash drives I can say this: the Lexar lightning drive, the one with the chrome exterior, is also fast, but the Lexar get EXTREMELY hot to the touch, which can certainly not be considered good. So remember that when you're looking into purchasing one of those. In contrast, this Imation 4gb drive did not change temperature AT ALL, and I touched it during and just after transferring those 3gb of stuff, and it did not even feel slightly warm. That is just utterly amazing to me! So it is fast, and it is cool. So I am very impressed. It is also a lot faster than the Sony 2gb retractable usb drive that I have.
You can indeed wear it on your keychain. I actually did this because of the first reviewer's comments, and I love it! Now I always have my stuff on me, and if I ever need to help someone with their PC problem, or I need one of my files, I have it on me.
The rubber sleeve, wherein the little usb drive itself fits, is very flexible/mouldable, and the drive itself sits very snugly into it, and there is no risk of it coming out. The o-ring itself is fortified and made out of hard plastic, as so that it is strong and rugged. I took the clip itself off because I have it on a metal ring that also contains my keys, but I could see how the clip could be handy if you want to hang it on your belt-loop or something.
What else can I say? I am really impressed with this drive and I would recommend it to anyone.