Sensei Course Participants
People are more likely to want to sign upon for a direction agreement when people involved are able to confer, so it stands to reason that this practise is currently common.
Visitors to your website will be able to see from the Sensei Course Participants widget the number of actual people that are enrolled in each and every class.
Take a quick check to see how many newcomers are enrolling in a class.
There is also an optional widget that, when added to your sidebar, will imitate a list of all of the students that are currently enrolled in the course. If you have community profiles turned on, a link will appear after the profile of each learner.