A One Page (sometimes called One Step) Checkout implementation on eCommerce websites reduces the number of steps in conversion. It shortens the funnel, increases conversion and reduces cart abandonment. When we replace standard checkout with OPC, we loose functionality to save abandoned carts as prospects. These prospects can be 'incentivized' later to complete transaction. It is recommended to implement save prospect on minimum data entered in tandem with One Page Checkout. We have written a blog article on it which explains OPC in even more detail.
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Responsive Theme Implementation
A responsive design is a key to mobile first design approach. With increasing number of users transacting and browsing on small/smart devices, it is imperative for a website/web store to be optimized for increased goal conversion on smart phones and tablets.