Wasn't sure if I should post this here or in the New 3DS thread. It seemed more fitting here.
I managed to land a Majora's Mask New XL last week, but Monster Hunter wasn't played in it until today. New impressions after 80 hours of play on my 3DS XL? This game is actually pretty sweet looking. Textures are standard Monster Hunter fare when it comes to the world, but wow at the textures on monsters! And the framerate? Actually good. It's not a solid 60, but it stays up there and it stays smooth.
Don't get me started on how great the nub is for this game. I still use the D-Pad, and even the on-screen D-Pad at times (when Hammering a head, generally), but for 99% of my camera control it's all on that little nub.
The 3D effect for 4U specifically is effectively unchanged; I loved it on my XL, I love it on my new XL.
Basically, if you have the money and can find reasoning to do so, I wholeheartedly recommend a New XL for Monster Hunter. It's not an HD remaster but to say it's just the same game is an understatement. Feels like playing 4U.5 or something.