Tried out ReR for a few minutes last night.

Like
The new gryoscope aiming method.
The 3D graphics on Very Strong
The shit scary atmosphere
The advantages the Circle Pad Pro will give to the controls

Dislike
The existing circle pad is a poor method of aiming. It isn't sensitive enough. Turning the stick 360 degrees results in your aim going more like an oval rather than a perfect circle.
Gryoscope aiming method is hard to use with the 3D visuals turned all the way up.