I really like the idea of converting raveners into shrikes. I like the models, but so far I don't see much use for them on the battlefield. When I'll be building shrikes, I migt do the same
Shrikes are gold. Pure gold. You have to make them expensive to work, but boy howdy are they a wrecking ball. Lately I've been using a single unit of 3, AG,TS,FH,SC,LW/BS. They hop around as synapse and then become the Murder Brigade for anything that doesn't have a 2+ save. (183 points) Last tournament this unit killed Ahriman and a full units of chosen on the charge. In another game they killed a Seerstar with ID wounds leftover.
I also like the unit of 5 with RC instead of LW/BS (230 points). These are really good TEQ killers, so long as they don't have Storm Shields.
If running multiple units I do squads of 4. 1 LW/BS, 3 with Rc, and 1 with a BS. (209 points). Pinning, really good CC ability, Ablative wounds with the BS model, and the LW/BS to target down any special equipment that you decide should absolutely die.