I wanted the pen to keep backup copies of personal files, but it does so much more, like synchronising a 10gb backup in around 60 secs. However, it is all the other features that are worth the price in itself. Just amazing to be able to plug it into another computer and surf the net, using all of my own favourites and even amend and add to them, without leaving a trace on the machine I am using. Also amazing to send and receive email by downloading from the server (rather than using webmail) when using another machine, again without leaving a trace on that machine, and then return to my own machine and synchronise all the files, with my explorer favourites, personal files and email records all updated, as though all of the work had been done on my own machine. Its also amazing to have a complete and free office suite operating from the pen (worth the money in itself). You have to be careful whenever you create new personal folders on your own machine, that you add these folders to the files that should be synchronised (not necessary for explorer favourites) and its a shame that the pen's technology does not enable the synchronising of two machines together, but then you can't have everything! The help file is somewhat limited, although there is more on their website, and a little trial and error is necessary. Its very small and compact and, if you don't want to use any of the stuff I've mentioned and just use it for file storage, then you just say so during setup and you still have a very fast ,neat and compact conventional USB pen.