We are a solution provider and I work with a lot of different SAN products, depending on the needs of the customers. we have implemented this solution, as well as the G series, for some of our clients.
I have a project right now that involves revising and fine-tuning a storage network. This network contains two Hitatch VSP G Series units. There is not a major difference between the F Series and the G Series. Both of them are enterprise-scale and efficient for many data centers. It is used as primary storage in industries such as banking, automotive, health care, and insurance. Large companies, or companies that have an IBM mainframe.
If the solution requires a very high IO/s (Input/Output per second) with sub-millisecond response time then they should select the F Series because it has better performance.