Question about 3D on HMD

I have a number of Stereoscopic 3D displays for viewing my own digital 3D stills. My favorite way to view 3D slides has always been a hand-held viewer, so I have tried a number of HMD digital devices to replicate the experience. The best two that I have tried so far:

http://www.cyclopital3d.com/View-Vaster.html

http://cinera.net/product/cinera/

The View-Vaster has outstanding optics, but the viewing experience is dependent upon the phone you use with it. I use it with an HTC DROID DNA phone which is a 5 inch screen 441 PPO 1920x1080. It is a clear image with decent colors, but the pixels are visible giving you a screen door effect. Not horrible, but certainly not ideal. I have seen this viewer used with the Sony Xperia phone and there was no screen door effect in general. However in images with uniform light colored areas, like open sky, you can see a light herringbone effect. Given the expense of the phone, I never sprang for one.

The Cinera on the other hand, has a full 16:9 aspect ratio and bright clear display with absolutely no screen door effect. It is the best digital 3D handheld viewing device I have ever experienced. The only thing I don't like about it, besides the expense, is that the lens are plastic and while good quality, they exhibit chromatic aberration.  Unlike the View-Vaster, the lenses are fixed-focus.  This has not been a problem for me and others who have tried it, but folks wearing eye glasses cannot see the extreme edges of the screen.  This is also a stand alone computer running Android, so over time there is risk of problems with the electronics or software.  There is a $100 discount if you buy direct.  It is also available on Amazon for less than full retail, but not discounted as deeply.

Overall I would recommend the View-Vaster for most people, but the viewing experience on the Cinera appears to be the gold standard for now, for this sort of viewing device.