I too noticed the flickering on the double hog kill video as well as with Ben's scope, and seems like I remember yet another video I saw that flickered as well. That leads me to think that all the scopes do that. Maybe I'm wrong.
The clarity of the X-Sight is pretty impressive as DoubleUp mentioned. It is clearer than the Photon.
It seems there are always trade off's with scopes, pros and cons. The sad thing is that the issues the scopes (X-Sight and Photon) have are ones that hunters really need fixed, ie flickering, poor focus, battery drain rendering the scope inoperable, white out, lack of external battery jack etc. I could do without an external jack if the scope wouldn't go into inoperable mode with low batteries.
Hopefully the companies will hear the cries and criticisms of people who actually use them in the field, and then get their techs involved to remedy the situation. If they do, I think we will have some great NV optics to look forward to in the future.