I'd have thought the point of this would be to either do the miniatures "better" (more detail, improved poses, etc) or cheaper than GW. But this is less detailed and about £2 more than the current Farseers and Warlocks.
Considering the legal issues Chapterhouse have been having / skirting, why bother?
nice idea. in two minds about it and hard to tell how off it would look until its next to another Eldar model , but they like to stick two fingers up at GW