To me the dial more than a little bit intriguing. It evokes the image of an instrument cluster in an exotic sports or race car. I especially love the thinness of the case, which is just slightly thicker than the beautifully thin 5711. And that 21K gold micro rotor in the 240 is simply magnificent.
Observations from other forums suggest the 8971 MC movement is actually a Jaeger-LeCoultre 846/1 manual wind caliber and yes, this would be quite small for the case. The movement is neither round nor square, but ellipse-shaped. To get an idea of its proportions, if you look at the rectangular minute
To me it's a near perfect example of Patek's perpetual calendar design. I love the applied romans and that retrograde gives it just a little bit more intrigue and class. Size is great and I've always been a sucker for a silver dial. I love it!