I got a Cosmo Black 3DS with SSFIV 3D Edition.
The only things that bothers me were,
Not having the start and select above the Y,X,B,A buttons like on the original DS.
Not having the power and home buttons above the slider analog stick, lower the stick a little.
The L+R shoulder buttons can easily be pressed which makes you activate the camera by accident.
The Y,X,B,A buttons are kinda hard to press even start, select, power and home too.
The top screen closes way to fast.
The Dpad is hard to reach but I rather use the slider analog stick anyways.
headphone jack was moved to the center.
No cool pack in game cart.
No second slider analog stick.
The things that I like were,
How the volume, wifi and 3D sliders were located.
The bigger top screen.
Style of the 3DS.
Came with SD card.
Man I played SM64 DS on the 3DS and I hated holding the Y button down to make Mario run instead of using the analog slider stick to walk or run like on SM64 on the N64. Wario wasn't needed except Luigi and Yoshi and Daisy or Toad should have been added instead.
SM64 really should be remade again with the graphics of SMG and also redo the controls too.