I don't have one but you get the Apple ecosystem with music and movies. The best part will be when IOS 8 hits tomorrow and you'll be able to share everything with your family.
depends what you use it for- i personally don't like to work out with my phone so i use an iPod for this- I also use my iPod at night to help me fall asleep while my iPhone charges. Different people have different needs
I use my android as a $20/mo hotspot and the ipod as a phone with google voice/hangouts. Not quite the same as a regular phone, but nice to be free from big carriers. I like that I dont have all those phones options i never needed, like 53 different volume settings
I didn't want to spend for iPhone yet wanted to take a look into Apple system , Touch was the cheapest way ..I don't have Android phone though..And its not adding anything or filling any void on my Lumia.. But it's a nice little device ,which I never really needed but wanted .