I haven't tried Hero Mode yet. I played so much of it once it arrived that once I finished it I couldn't play any games for a few days. I want to play it again for Zelda alone. <3
The ending was fine. Hero Mode was easy. Yeah, I love the way Zelda was portrayed in this. Skyward Sword Zelda is by far my favourite incarnation of her. And I loved the relationship between her and Link. It was really well done.
I recently beat Ocarina of Time 3D and found the Master Quest. I haven't gotten far enough to really speak on difficulty (although I was able to bring down the first boss surprisingly fast) but the mirrored maps drive me up a wall. Having an area you know change on you is worse than when you didn't know it to begin with. At least for me.