Excellent
I have 4 cats, my Pixie Bob had a stomach/digestive disorder and after months of liquid poos, accidents, weight loss and tests at the vets, I decided, as a last resort, to try a different diet to the one the vet had recommended.
I put her on Porta 21 chicken meat for sensitive tums along with a natural digester. She ate it but kept losing weight, though motions were becoming normal. I then introduced Porta 21 biscuits. Over a year later, she's still going strong, in fact she has put weight on and has no problems whatsoever - and a diet will be starting soon!
My other 3 cats, one of 18 years old, one who is 12 and the other who is 8, all eat it fine. The 12 year old is a really fussy eater, I was amazed when he decided he liked it too. For the first time, this slight built cat has started to put a bit of weight on.
I'd definitely recommend it, yes it smells strong, but does it matter as long the cats like it?!