i've used groove for collaboration and it worked great.
i had never previously thought of using it for sharing music, films, etc. the problem that would have to be thought through is that the nature of the file sharing in groove is to replicate everything placed in the shared directories across all members of the group, which would obviously not be practical. there may be some other way of offering up files on demand, but i have not tried to figure it out. i'll let you know if i get around to it.
otherwise, i recommend it highly for collaborative work efforts.
