Episerver allows you to create and edit content and preview it as a whole before publishing it. Some people require another layer of editing where it is done on another server in another database and then moved from staging to production.
Episerver provides a .NET B2C and B2B commerce platform. B2B Commerce Solutions require more specific features such as order pads, organizational based pricing, quick order, impersonation, quoting and more.
It has often felt to me like Episerver was the best-kept secret in North America.