I was hesitant when the vet prescribed this to us for our cat but she loves it! The large morsels force her to chew and it cleans her teeth. It's not a perfect alternative to brushing, but brushing our girls teeth isn't a great option.
There was a bit of hype over this product. I had high hopes as I find all instant coffee brands to be bitter and not taste like coffee at all. Unfortunately this product tasted like all the rest... Someday I hope an instant coffee brand will set the bar! Until then I'll stick with my beans.