Trust me! it is fastest checkout Magento module :)
Its used progressive enhancement to "AJAX" the cart information across pages
The off-canvas flyouts to hold all of the cart's information and checkout on same place, we define it a 'BOX', not a 'page'.
Customer can do with a regular cart — update quantities, add coupon codes and they can immediately begin to check out.
Checkout any time, from any page they are on, no reload, no waiting their time
There's nothing in your cart yet.