I'm really interested in buying a grey knight redeemer from
FW, but I was wondering rules wise how I could fit it in? Has there been a
FAQ or errata about
GKs being able to field this variant or even a
FW imperial armor book about it?
Also how would you guys feel about playing against one? Would you allow it even though it has those amazing
TL psycannons of doom?

Thanks for any feedback, I just don't want to spend money on a model that will see more shelf time than table time.
-Reaver