The Hemlock's Horrify ability ends up being really awkward to use, because you have to do it before you move, and even with the Flyer benefits, the thing is incredibly fragile to be leaving within 18" of an Enemy Unit for a Turn.
WraithGuard, I've seen work well, but WraithBlades just get screwed by the fact that after they Disembark, they have to stand around for a full Turn getting shot before they can Charge. I've been very underwhelmed by their performance, the times I've gone up against them.
The rest seems pretty solid, but I might tweak by, say, picking up one more Bike and splitting into 2x3 so they can hide more easily and claim/contest more Objectives.