This is good information to know. I use dropbox is a purely cloud storage usage so I can share things with other people for different things. Only think I do not like about it and prefer Google docs over is the instant editing. I got documents have have 4 people as editors and we can all edit the same thing at the same time and while it does not happen often it is very useful tool when we are all trying to change the same document.
I know dropbox has its own way of managing that with making conflicting docs when multiple people are changing the same document. That is probably better for a corporate setting but for I would say my home use I still like Google docs.