I was skeptical at first, but my Argentine B&W (Panda) absolutely loves them. He even goes after them if my hand is near, so I am using it to develop socialization. The balance must be great, because Panda has grown over 1" in 5 months on it.
I am going to have to build him a custom cage by October at this rate. I am going with a 12'x2'x2' so he has room to grow to max size comfortably, which I expect on this diet.
The ability to keep it frozen until needed makes it so much cheaper in the long run vs. finding the food he likes, making sure the balance is right, processing it, flavoring it, and so forth. With the links, I just defrost and put them in his feeding bowl or hand-feed them with tweezers.
Love this stuff.
The only thing that would make it better is the option of local pickup since I am in Ohio.