The NetApp E-Series has two models in Hybrid Flash (E2800, E5700), and two in All Flash (EF300, EF600).
Importantly, All-Flash models also support one 24-drive shelf for NVMe disks!
These models (EF300, EF600) also support adding SSD, SAS, and SATA disk shelf(s) later on. However, all models are highly scalable reliable, and cost-effective. For example, E2800 entry-level can be scaled up to 1.8PB!
The primary use case(FC-SAN and IP-SAN only) would be where the customer is looking for native storage performance(low latency) cost-effective solutions. Media and entertainment, Video Surveillance, Oil and gas, and Big Data Analytics would be the best fit for E-Series Storage Solutions. The NetApp E-Series is also the best choice to use as backup and recovery storage.