Been playing with my n3DSXL since yesterday and it's awesome.
Pros:
- The 3D is actually amazing this time around. (Played MM3D on the bus/metro this morning with the 3D on max. Something simply not possible on the older models)
- The performance boost makes a huge difference, and it's very noticeable. Loading up Smash isn't so bad now.
- The c-stick is actually pretty great. Not sure how it'd fair with a shooter, but for controlling the camera in MM3D, it's great. Also tried it for Smash and it's fine there, too (don't use the c-stick much in Smash).
- Auto-brightness
- Buttons feel better. Is it just me or are the ABXY buttons bigger on this model? It sure seems like it.
Cons:
- The position of the power button is the worst. I find myself accidentally hitting it all the time.
- The position of the stylus isn't great, either.
- MicroSD card slot is in an inconvenient place, however, now that I have my 32gb card in there, it's unlikely I'll be touching it ever again.
- The gloss isn't as good as matte, however, it does look 'nicer'
Really happy with it.