Love it!
Overall: dogs love it, great for the coat and energy, easy to digest and not as expensive as it might appear!
We have two active corgis, one who will be 2 in May and the other will be 8 in July. Previously, they were eating Marcus Muehler and got on with it fairly well, although one of them was a bit fussy with it.
When we started Simpsons, it was to see whether it would help the younger one with a skin allergy he was developing at a 1 and 3 months. It seems to have helped (I can't be sure if it was the food or just a change in the seasons) but both dogs absolutely love the food.
I noticed within the first several days a lot more energy from them, to the point that I adjusted their food and gave them a bit less. They love the taste so much I can use it as training treats.
No problems with digestion (not even at the beginning) and stools are firm and easy to pick up and unlike the previous food, there was less of it. I did try one order of the chicken, to give them a bit of variety. They liked it well enough but their stools were noticeably more whiffy.
Their coats are lovely and the vet has commented on this on more than one occasion.
I was very concerned about the cost and initially I was only going to buy this food temporarily. But even though this bag is 3kg less than Markus Muelher and costs more, I can say that over the past six months, I have placed fewer food orders so they clearly meed to eat less of it.