PureDisk is def cheaper up front.  However, dedupe rates and ingest performance 
are no where near what a DD box can do.
Factor in also, if you did you "Older," servers, what is the 3,4, and 5 yr 
maintenance costs on that, for those servers?  Not to mention the storage.

IMO, while a higher up front cost with DD, the long term TCO would be lower.
Sometimes cheaper and "good enough," are not enough.

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