CESSDA Metadata Standards Portfolio, outcome of CESSDA Metadata Management (CMM) Project, includes core metadata model and controlled vocabularies (CV) for relevant metadata fields. The Portfolio was designed to ensure compliance with Data Documentation Initiative (DDI). We present the results of the concluding task of Phase 1 of the CMM project, where we analysed the impact of the proposed Portfolio solution and identified the challenges for its implementation. 13 CEESDA members and 2 additional stakeholders participated in the survey and provided feedback on the proposed model. We evaluated the Mandatory elements of the Portfolio, applied the (adjusted) System Usability Scale (SUS) and investigated the metadata availability. We were interested in how SPs use DDI, especially to what extent they already provide metadata and whether they would be able to adapt the existing solutions to the one proposed in the model. Moreover, we asked SPs about their usage of CV (DDI and ISO). Based on the results we gathered, we also drew some comparisons between Service Providers (SP) at different stages of development. Our presentation concludes with discussing further work in the following Phase 2, where we plan to upgrade our evaluation survey. Moreover, a special focus will be given to exploring the Metadata Model usage possibilities in other organizations apart from CEESDA SP (e.g. domain stakeholders and related organizations).