The predictive memory caching really helps in our environment, snapshots encryption and replication for DR were all important factors in the decision making process so as Nimble has all of these features it was easy to select the product.
Not much, it's a good product that works well. My only gripe is that before the HPE takeover I found the support to be more helpful, I guess this is because they were only Nimble storage engineers and now that it has been merged into HPE the support guys have to support more than one product but I'm sure in time there subject matter will improve.
Make sure you use the sizing tools to appropriately size your environment
Helping us speed up SQL performance and generating reports quickly saves the business time, and you know what time equals, money! So the powers that be are very happy with this result. Of course DR is also a big concern for them and they are now happy that our DR plan is sufficient.