I love Royal Canin Maine Coon!!!
Really - they should pay me to advertise this stuff but if you've got a Maine Coon then it'll do all the selling itself!
My cat was overweight and had a dull coat, as well as plaque ladened teeth from being fed on the usual wet pouches. The vet recommended lots of things like cat tooth paste, cat smell air-fresheners, etc. etc. but the Royal Canin stuff changed all that! Not only is his health and appearance better but because the food is dry it's easy to store and doesn't have the horrible smell of wet food. It's a win-win for everyone and works out realistically only a fraction more expensive, if at all due to all the offers out there, than normal supermarket fare.