I'm not a huge fan of Stormraven with
GK, but not because I don't like Stormravens -- it's just that they are expensive units (200 points) and with
GK, your unit count is already so low.
I like Stormravens because they bring reasonable antiair, decent air-to-ground, reasonable transportaion (the extra dreadnought slot in the back is cool), and high durability (being a flyer). Plus it's physically large unit that you can use to block access to objectives. But 200 is a lot of points, when you're talking about what's left to spend in a
GK army.
Just me