I'm a twin. Really, it's not all it's thought to be. You have to share everything, you are expected to like the same things, be able to do the same things, have similar hopes and fears, be good at everything the other is good at, you always get compared to them, and perhaps the most annoying is that you always get called the wrong name!
But, to answer the question. We do get along well sometimes, but we fight a lot too. That comes with having little privacy. I'm not so sure about the similar point of view question. Sometimes, having the same thoughts and ideas is a good thing. Sometimes, it is not.