SAP Analytics Cloud integration with AWS Redshift

Does anyone have experience with integrating SAP Analytics Cloud with AWS Redshift? In particular, are the SAC JDBC connectors a performant and reliable way to exchange data, or do we really need to move data thru files & S3? If we have to make all of our SAP instance data available in both Redshift and SAC, would it be better to use live connectors with SAC to the SAP instances, and use import/export of files to S3/Redshift independently, or to use a more consistent approach (ie import/export files to both). Are there specific tools that anyone would recommend that have been used to reliably perform SAC<=>Redshift integration at scale?