The more I see that second circle pad the more I'm beginning to like it. The reports have all been positive so far with just about everyone stating that the attachment is very comfortable and easy to hold while making the 3DS feel more sturdy. The impressions of the controls for MH3G without the second circle pad have been positive as well. There is no "Claw" method of control in this game since the touch screen does a good job of controlling the camera with the virtual d-pad.
Have a great weekend friends!