We are feeding Akira the VAN puppy mix and instead of mixing it with mince we are giving him RMBs. He has eating this for the past 3 months (he's 7 months old now) and he seems to be thriving on it.
He is growing a good steady rate and only once has he seemed a little bit overweight, but that was because I was feeding him too many RMBs!
It definitely gets a thumbs up from us.
Oh and his poo is firm, it does have some cereals in it but on the packaging they say
"The whole grains are added for bowel roughage and should normally be present in bowel motions."
Hope that helps!