This is gonna sound like some kind of scam but......... on a whim I purchased a set of Nikon "Action" 10X50s at the local farm/ranch store.
This was before I had two good eyes and didn't desire to purchase a "good" set quite yet.
My son, the optical expert, photographer, etc. said that these were really great.
After the bionic eye job the first thing I did was give them a good check out.
As far as comparing with Ziess or Svaros except for things like falling off at the edges a bit and other finicky stuff they are right there with them.
I doubt that they are as robust as the high end units but the difference between $39.95 and the high ender's cost would be tough to justify.
Just my experience, and the comparison was fair.
Hope I'm not doing anyone a disfavor but they are worth checking out.
We'll really see what's going on when the NF NXS is compared to them. I may be quite disappointed. Been there before.