It depends how stable each person is. If you're both very stable people, It will work very well, If not, prepare for lots of drama or abandon ship ~
Are not all friends a benefit?
I've done it, and it ended up evolving into a relationship.
Problem with it is more than likely one friend will want more and the friendship is ruined. Better off to just have sex buddies! Like hot dumb guys/girls you sleep with on occasion!
I think its great, only if it stays like that and no one wants more