If you're using a multi-page checkout configuration with Drupal Commerce you've already discovered how powerful and easy to use the system is, you can drag and drop the checkout panes within the pages but there's room to improve it.

Proof of this is our featured module of the week Commerce Checkout Progress provides a block and some settings in order to display to our customers in what step of the whole checkout they are, so if you're using several pages for getting the user through the checkout process no doubt you'll find this module quite interesting.