I have 4 bows that have extra limbs, and I never have used the extra limbs except when I first bought them to try them out. One joker in the deck is that the limbs I ended up leaving on the bow and using are not always the same limbs I thought I would use the most when I bought the bow. But if you're buying the bow mainly as a target bow, and think you might want hunting limbs, or vice versa, it might be better to save your money and buy the more specialized bow sometime in the future. Of course, if you only intend to have one bow, then extra limbs might be a good idea.
I'll never buy another bow with more than one set of limbs. Now I might buy a bow and later not be happy with the limbs and order a different set, but that's a different thing.