I've looked through, fondled or owned all of the ones you've mentioned.

If the Duovid and switch power fits exactly what you're looking for, I'd not fret the age on them - they're fantastic.

The EDG is spectacular. If you plan on owning them for life, they're a splendid pick. If you think for a second you may move them at some point - you'll take a serious bath on them. They don't carry the brand joie de vivre as some other popular brands and Nikon CS is a hit or miss proposition - mostly miss.

For that reason alone, if you've narrowed it to "latest/greatest" technology, I'd choose the Swarovski without hesitation. (not to mention it's a top-of-the-heap bino)

Also, don't rule out a Leica Ultravid in the X's you're interested in.

[Linked Image from i.imgur.com]

WWP53D