Rather than take other threads off-track where this comes up, here's the place to discuss the merits (or lack thereof) of screens that are not fixed to the back of your camera.
First the upside: When the screen is open, but flush against the camera body, there is no difference from any other camera screen. When the screen is closed, it is also flush against the camera body, but the screen is protected against scratches and other damage. In this position, when you want to shoot only through the viewfinder you get zero annoying stray light from the screen and no nose prints :-) For these reasons alone, I see no reason why every Nikon shouldn't be so equipped.
When you swing the screen to the side, you get the ability to shoot low to the ground, or high above your head without twisting your neck into an unnatural position. For astrophotography on a tripod with the lens pointed up to the sky, the vari-angle is a must, and for macrophotography on a tripod pointing down it is very convenient. For almost any shooting situation where you use live view, the vari-angle is helpful.
The downside: Some folks feel that it is too flimsy for a pro camera, or that if you drop your camera the screen will pop off. In practice I don't see the screen as being any more of an issue than say a remote cable or gps connected to the camera. And that's only when extended. If it is flush, there really is no downside.
Looking for any comments or feedback on this line of thinking.