After trying every free plugin for mobile responsive menus, I couldn't find anything that actually worked as it needed to be: Just a clean mobile menu that lets me do full-page menu and customize for my needs. Make sure to look through the comments section to see any tips and tricks from other users. Within seconds you can get up and running with a cool mobile menu. I would suggest to be comfortable with a little CSS modifying if you want to use this plugin!
Suggestion for AthenaStudio: Build out the front-facing dashboard with more options so less CSS related modification have to be done by the user.