This caddy is ideal if you have a 2.5" SATA internal hard drive spare in the house.
It really helped me free up much needed space on the computer and now, the newly created hard drive is being used as a media hub for the family music, photos and videos.
Installation was very simple taking no more than 5-10 minutes to fit the hard drive. Everything is provided in the box (screwdriver, screws you name it) even a velvety sock to protect it when you are travelling with it.
If your planning on formatting the hard drive in FAT32 and your using Vista, you might run into a problem that won't allow the drive to be formatted in FAT32. This is a very minor criticism though as it requires (after a quick search on google) the "HP USB Disk Storage Format tool".