I view Cooper's kits as beer ingredients. When I started off they were the only ingredient (plus dextrose I guess). Then I added another ingredient, DME. Then I added steeping grains. Then I added hops. Then I added 2-row (partial mashing). Then I added chocolate and lactose. Then I swapped out the yeast. You get the picture.
So far at the base of nearly every beer I've made you'll find a Cooper's kit (or two, Stout/Dark Ale tocan for instance). I'm still experimenting and having fun (ie. not bored). The beers have been interesting and sometimes pretty good.