I thought I would add my view on the circle pad pro (CPP).
I have played about an hour of the game and it is fantastic with the CPP.
I was one those those people who wrote hate mail to Nintendo abut not including a second controller under the buttons when the first 3DS images come out. However, after using the CPP, I am kind of glad they didn't.
Yes it is tacky because it is an addon, but what I like is the shape and weight. This may be my personal opinion, but it makes the 3DS so much more natural to hold as it feels like a genuine controller.
I hope if they ever revise the 3DS and add the second circle, they also make a plastic cheap cradle to hold it.