We shouldn't be throwing large amounts at young talent when we have enough already. Atletico payed 20 million euro's for him when he was phenom in Argentina. With a successful U20, and a good La Liga campaign, I wouldn't be surprised if his price has doubled. He is to expensive, and that money could be spent more efficiently.
Still, he is a fantastic player. I saw him live a few times at the U20, and he was awesome. Aguero and Di Maria were the 2 most exciting attackers for Argentina. Juve should have gone after Di Maria. He is at Benfica now, and there fans are impressed.