Mame,
No, we've never had them, but I have done a lot of research on them. They sound like great meat birds with a great ROI. There is really nothing frankenbird about them; just a chicken that is selectively bred to turn good feed into great meat quickly. I have even emailed Joel salatin about it and these are the birds he says he uses on his farm. He is the one who recommended to source them as locally as possible as breeders select specific traits for specific geographical regions. So, as long as the godfather of pastured chicken is ok with these birds I don't think I have anything to worry about. Do you know anybody locally who might have some to sell?
Callmechef