In all-flash arrays (AFAs), architectural design choices can have a major impact on the quality of the enterprise storage life-cycle experience. Pure Storage, a leading vendor in terms of enterprise-class AFA revenue, changed the industry forever with the introduction of its Evergreen Storage program back in 2015. The program gives customers a number of guarantees and investment protection offerings that enterprise storage providers had not provided to their customers before. These elements range from guaranteed data reduction ratios and overall customer satisfaction to non-disruptive upgrades and multigenerational technology refresh, capacity consolidation, included hardware upgrades, and on-demand trade-in credits. Evergreen Storage has prompted responses from Pure Storage's competitors, which are now offering programs of their own. In Pure Storage's case, many of the guarantees and offerings are not just marketing programs, they are directly supported by specific design choices and features in the company's FlashArray system architecture.