Kroak was intersting, I played 2 lists, one against Jack Armstrong who was deepstriking kroak with an additional 28" range on celestial deliverance. That went horribly as expected. Second game against kroak was against the Scots and he wasnt using the same range mods and was relying on teleporting kroak for his mobility, he failed the port turn one and as a result left himself out of range of a lot of my units but within threat range of a double turn, which I won. The matchup itself is heavily weightedin the frogs favour but when he is working off base spell range, or only slightly increased, you can plan around it. When his spell is essentially board wide you might as well not deploy if your playing daemons. Ofc lens of refraction will have a major impact on this if you are running it.
I used the seekers as fast blocker units, they would wizz up the board and engage units I wanted to tie down for a few turns, I was happy to let them die so long as they clogged up opponants movement and stopped his stuff getting to bear, the daemonettes would then swarm objectives and outnumber the faster units that had claimed them first. Seekers having to charge was an initial worry for me but I have never fought a game where the objective holding units wearnt in cc so for this event at least it was a moot point
The list isnt optimised at all though and there are definitly better builds, more chariots and the inclusion of hellstriders spring to mind, but it is very fun to play. Having 3 units of seekers is great fun as they are so fast it catches folks out, its just a shame they hit like a feather