Jax ate RC for a brief period, but very brief... so I can't really judge completely but I think he ate it for about 2 months and he began getting tarter/plaque buildup on his teeth faster than usual even with brushing. Never was happy with his poop either. He sure loved the taste though!
Honestly? he did really well on Purina One Beyond while we were waiting for Farmina food to come out in the US. But honestly, I haven't seen a huge difference between the two. I may end up feeding Beyond again as our main kibble simply because it's easier to get locally and is cheaper. I think the chicken one smells really good actually but maybe I'm weird!