Kotaku:" Nintendo has once again made an add-on second Circle Pad for the 3DS. And, you know what, it's not half bad. Actually, it seems like the Circle Pad Pro for the XL could be pretty good.
The smartest thing about the larger Circle Pad Pro is its design. It's not nearly as bulky as the original Circle Pad Pro, gradually jutting out for the second Circle Pad. This shaved design even has a ergonomic slope for you to rest your palm. It's a smart design on Nintendo's part, and it feels nice in the hand—comfortable, but not too big."