I have just updated the list to the new version which can be found on the first post or here:
Emperor's Children updated 14 May 10:10PM AESTChanges made:
- Removed Indomitable as an ability
- Removed Ecstasy Rule
- Removed tiered restrictions for purchasing formations
- Sonic Retinue is now the Noise Marine Retinue with 6 Fearless Noise Marine Units
- Removed Possessed formation
- Added Sonar Formation
- Added Sonar Lord
- Added new Decadent Unit with Daemonic Pact
- Repriced all effected units
- Apostate of Rapture had Leader removed and dropped to 25 points
- Added Noise Marine upgrade
- Repriced Dreadclaws
- Renamed Defiler Formation
I hope all the above meets most of the feedback provided. There are many differences there to set it apart from the BL list and cheaper (yet balanced) formations to ensure a competative list
No doubt points will be scrutinised and I still have to look over things such as the Defilers, Daemon Knights and all the War Engines.
Note: Seekers still need to be reviewed
I have tried to make it more enticing to use Daemons by giving the DP to the Decadent Formation and reducing the cost of the Apostate. Seeing as they are also the only Drop Formation, hopefully this entices people to use them for one or more reasons

Let me know what you think. If it works I may adopt many of the ideas to the World Eaters as well.
Cheers.....