The Vale's class name is "Fast Cruiser", but it's a destroyer. It looks like the Fast Cruiser name is either copypasta or a typo.
Aside from that- I love the Castigator. It's become my new favorite ship. It may be nearly as expensive to field and maintain as an Onslaught (or more expensive for the GH version, I assume), but it's fun as heck. It looks great, it heavily armored and punchy, and plays like a mini-Onslaught that can turn faster and run ships down, guns blazing.
You get a gold star for that one. It's a great addition!