The solution, in general, is great. There isn't one feature that stands out; holistically it's a very good solution.
What needs improvement?
The solution doesn't have a web proxy built into the system like Sophos. This is something they should work to change. Sophos also has a scanner that's on the interface itself. This solution would be improved if it added this functionality to it as well.
What other advice do I have?
We use the E-2000, 3000 and 5000 series versions of the solution. We use the public cloud deployment model. If an organization is not looking for a web proxy, it's a very, very good product. It's stable. It's simple, and the support is great. I'd rate the solution nine out of ten.