Got the game yesterday, I'm up to Jabu Jabu.
I played the young part a couple years ago after getting the game from someone who was throwing it out. On N64, the game is limited by very poor performance, a vaseline filter, and pretty bad graphics. Overall, the game looks more brown and ugly than any game this generation.
But on 3DS, all those problems went away. There is seemingly no change in any of the content, proving that underneath it's rough and dated exterior was a game that set a standard so high it still hasn't been surpassed. The content has always been there, but finally, it's all playable. The graphics are adequate and will stand the test of time through a unique style between OoT and WW, it runs at a rock solid 30fps, and looks stunning on the 16:9 screen in both 2D and 3D (which effectively is a super widescreen, allowing you to see more on the same screen compared to 2D).
It's perfect. I really think this is one of the most perfect games I've ever played and this port or remake or whatever it may be takes a game chock full of perfect content, playable only through nostalgia, and makes it timeless. I can't wait to revisit this game over and over like so many have, because I'm already enjoying the fuck out of it.