One Step Checkout Pro

Live Demo

Frontend: http://demo.mage-world.com/170d2/

For quick review, you can add a product to cart and then select Process to Checkout.

Play on Sanbox

Frontend: http://demo.mage-world.com/170s3/

Backend: http://demo.mage-world.com/170s3/admin

On the Sanbox, you can review the extension fully with both backend and frontend access.

+ Configuration: System -> Configuration -> Mage World -> One Step Check Out