I'm looking at getting my first good transmitter. I'm pretty much sold on the DX4s or r. I've just been pricing them up and have noticed Amain and gonitrohobbies on ebay are giving away 2 x ACV receivers for 'FREE'. This sounds like a great deal BUT the sceptic in me is asking why. Is there a new model coming out and they are trying to clear stock???? Or is this just a SUPER deal???