If it can do face morphs (including lip sync), LOD levels for crowds, animatable wrinkle maps (for example to make forehead wrinkled when angry), corrective morphs for smoother animations, supports UE4 physics and IK (I think it should because it uses the same rig, right?) then I might buy it.
Also, does it actually use the same rig as UE4 skeleton or a more detailed but compatible rig? UE4 rig might be too basic for more detailed animations.
In the end, it is somewhat expensive (although having a discount currently), considering that iClone Character Animation Pipeline bundle with 3DXchange pipeline is required for full FBX support. But if you compare it to DAZ Studio - well, DAZ developer licence usually costs the same.