I'm gonna say 'meh' with the hexwraiths too really. Just played my 9 year old's Stormcast which pretty much annihilated the spirit hosts and the hexwraiths with a combination of vanguard hunters and liberators (yes! Liberators!). Even without the rending of my units, both are pretty pants points-wise and did naff-all damage. Hitting them with a "wet flannel" might have done more damage (that's 5 to hit, 9 to wound, for all those wondering). The spirit hosts were particularly useless in that regard, other than lasting in combat for almost 3 rounds, which was nice.
But then who cares, really? My nighthaunt look much better than Stormcast. So sure,I had my butt kicked, but my ethereal butt was better than all that sigmarite butt, all day long.