I've never heard of them or seen them in my local stores. They look pretty good on the surface? Worth a deeper look at least.
My one concern at an initial glance is that most of the foods have so many different protein sources, possibly putting you in a bind if you needed to do some kind of elimination down the road. Most of them have chicken, beef, pork, fish and some even bison all in one food. I've never heard of grain meals before but they seem to include them - alfalfa meal, oat meal - not sure if that's a good or bad thing or irrelevant. I did see "blood meal" in one of the formulations, which would put me off of at least that one.