From Wayne in Chicago:
I have to admit, I had some trepidation about this before I bought two of them. Why? They are very thin, and I thought they would not provide the padding that I am familiar with in traditional harnesses and straps.
Well, my fears were unfounded. They are amazing. They are so lightweight as to be unnoticeable, even when wearing for prolonged periods. I even tried them with just my t-shirt, not a padded jacket, around the house for two hours (it;s wintertime, so not outdoors), and no pain, cutting neck, etc.
The key is the instant adjustability with the slip toggle in the back. Instantly can change from neck strap to bandolier-style to traditional harness. Instantly change if adding a jacket or extra thickness beneath them. Instantly change if loaning binoculars to a different sized person.
Sure, sometimes I ask the person behind me to adjust rather than taking them off to adjust myself, but it's not an issue (so much easier than a traditional rather fussy harness). I especially like that I can loop the tether over the objective lenses for a very tight fit against my chest when I need to (e.g. hiking steep hand-over-hand rocks). I discovered all of this from the Rick Young videos online (search your favorite video channel). And the price at EO is better than the native site itself! Thanks!