If you don't know what you'd do with one, then don't buy it.
I personally have reasons why I don't want to buy a huge capacity iPhone/iPad. One of them is that if it breaks, it breaks and there goes all my music, pictures, and apps. So I like having it all separated. I'd rather reload apps than I would music. It's a PITA, especially when you have to decide which tracks go in since my library doesn't even fit into the classic - And yes, I CAN tell the difference, so I can't downgrade tracks.
I use my iPod Nano for music, counting my steps, podcasts, listening to the radio, audiobooks, and iTunes U content. I also use the photo app for viewing flashcards that I make on Quizlet, export as PDF, and then JPG. 😀
But if you're not into any of that, then it'll just be something that sits in your drawer. So really think about it before you spend the money.