They've also been bred for yield rather than flavor for generations:
http://usda01.library.cornell.edu/usda/nass/industry-structu...
http://usda01.library.cornell.edu/usda/nass/industry-structu...
I have harvested a few birds so far and they taste so amazingly deep and rich that it was almost too much on the first bird. It's all about what the animal eats, IMO. I've had farm raised chickens from all over before we settled here and I've never had them taste this good.
The fat layer is a deep golden/mustard/yellow color and there is LOTS of it. None of my Cornish Crosses exhibited any leg issues or anything and one Rooster has lived to be about 4 months old. He's in the fridge on a salt cure waiting to be roasted this weekend!
FWIW. :-)