What advice would you give EMC customers looking for improved performance and/or big data analytic warehouses considering SAP HANA?

SAP’s HANA combines compute, memory, compression, columnar indexing, non-disruptive updates, parallel processing, and advanced Intel chip functionality.  That combined with SAP Business Objects and Mobility makes for a compelling business case for a one stop provider that only gets better as memory prices plummet and clustering increases in-memory scalability. 

SAP and EMC customers are asking compelling questions and looking for guidance.  What advice would you provide to answer these questions?

1. Is the in-memory market stable enough to jump in for any of the major vendors?
2. Besides SAP HANA, Exadata, Teradata, Netezza, and Greenplum, are there other vendors that can do high performance analytics?
3. Should I wait for HANA to mature if I have the luxury and if so until when?
4. If I decide I need the analytical performance now what are the best criteria for picking a vendor?
5. What questions should I ask each vendor?           
6. What are the strengths and weaknesses of each solution from storage only analytics to all memory and everything in between?
7. What are the key differences between HANA, Exadata, Teradata, Netezza, and Greenplum?
8. Does one solution handle unstructured better than another?
9. Are any of these solutions better for a true cloud solution including mobility from cloud to cloud?
10. Do these products address true data integration and archive retrieval?
11. How can EMC best become an in-memory appliance player no matter what the customer chooses?