There are three editions of check out modules, namely Standard, Professional and Enterprise. With Standard and Professional edition customers can use on a single domain, however, Enterprise license allows for use on unlimited domains. Importantly, Professional and Enterprise editions entirely supports the Professional and Enterprise edition of the Magento ecommerce plat form. It is said that One-step Checkout has increased sale even up to 60%. One step check out helps customers easier, faster check out, reducing shopping cast abandon. As a result, sales are boosted. One step Checkout is probable the best choice for you to increase sale.