Great new feature! I was really excited when I saw it pop up. This is very useful to me and is already being put to good use.
One thing I'd also like to see is something similar to what Brian Gomez has requested, and that's being able to add a seat and set what they can see. So, I could share a seat with someone (colleague, client) who can only see certain campaigns but not the entire account.
Keep up the great work!
