V840 is good, but could do a little more
First off, I like the V840 option. For workloads that are I/O intensive and compress well, the V840 can make a great fit to turbo charge your customer environment. Now, as XtremeIO will get compression along with Dedupe soon and PureStorage already meeting these requirements, I think the V840 will need to add deduplication to the software set to remain a viable option. But the ability to also manage external disk is a huge benefit. This makes the option available to use this as both a dedicated AFA as well as portion it off to double as a automated tiered architecture with spinning disk.