If you have the Vita version of this, the 3DS version may bug you a bit. They took out a number of details. I got it pre-owned, but took it back because the cart was fudged-up. I got to the NiGHTS level in Grand Prix and that's where the cart went crazy, so there's no telling how the rest of the game looks.
This is the cheapest I've seen it new. Since I like 3D, I'll get it at under $15/new.
But, yes, they took out way too many details.