Updated on April 07, 2020: Modified the condition to add != operator as well. So it is now possible to check whether the current logged in user has access or not have access to a particular membership level.
Use Case Example: You have a membership level in RCP called "Premium". You have a Section in a Template/Page that should only be output on the front end for members who have paid/subscribed to the "Premium" membership.
Select the Section, click on the Conditions icon, add a new condition, select "Restrict to active members of a specific membership level (enter ID)" and specify the ID of your membership level (1 in this case).
Once done, this Section will not be printed on the front end for users that don't have active access to your membership level.