I use it for an org with anywhere between 25 and 50 using it at any one time, assuming that you spend a bit of time organizing the folder structure at the begin

I use it for an org with anywhere between 25 and 50 using it at any one time, assuming that you spend a bit of time organizing the folder structure at the beginning it's not a major issue but it does require staff discipline to keep it organized. It doesn't beat a dedicated Document Management system but it strikes a nice balance for working on frequently updated files.