Display checkbox in WooCommerce backend, and display content frontend

Hi!
I am building a site for a client, where i need to display a custom checkbox in the backend product editor, and if the checkbox is checked, then display som content on the frontend.
I have tried this tutorial: http://www.remicorson.com/mastering-woocommerce-products-custom-fields/ and it actually works, but will only display "yes" or "no" depending whether the checkbox is checked or not.

I have looked all over the internet for this, but can't find any answer, so I really hope you can help me.