Sometimes you may have to pull few people from your team for an important sales meeting with your client. When everyone on team is having a busy calendar, it gets much harder to bring everyone togather. Which means deals take longer to close. FreeBusy eliminates email back and forth to discuss when who is available and help you find time to meet much faster.
If the same team members are usually pulled for this type of meeting you can also create an event template with all of them to show available times when everyone on team is available.