I was very keen to try dropbox, after hearing my daughter singing its praises. I found it very easy to install and to use. I like the way that you can access it via the web, rather than having to install it on all the computers you use (I did consider installing it on my laptop, but as I use a version of Linux not listed on their installation guide, I chickened out of downloading it).
Sharing a file was also easy as my husband already uses dropbox, but it was good to see that you can also share it with others who don't have an account. I like the fact that you can store multiple file formats, as I have been frustrated by the limitations of Google docs, when you want to do something that is more than a basic document. I can see therefore that I will use this more (though mainly for text-based documents so hopefully the limits of the free account should not give me too much of a headache).
I have been warned by those that have used this in the past, that one has to be wary of dragging and dropping a file into a dropbox folder, in that the original copy is lost (the person telling me this had then deleted his dropbox copy, and was rather dismayed to find he no longer had a copy at all).
All in all, a great tool, which is likely to be added to my list of favourites....now all I need to do is try it on my phone...