Since having our female adult cat Tilly, we've tried to introduce her to some variety, and she's been happy to experiment. She came to us with Whiskas as her dry food option but I read it isn't supposed to be that good. So we tried a small pouch, 300g, of Pro Plan House Cat and two other brands.
Tilly loved this variety so she took to it straight away. Then, within weeks, we started noticing how shiny and soft her short black coat was. Also, one hair ball only, months ago, which I think is pretty good!
We now buy the bigger 3kg bag because it's cheaper. Ours is still going after 2 months, and there's probably enough left for another month.
By the way, we also feed Tilly some wet food in the evening, to make her diet complete.