I see. I'm also a glasses wearer and know that sadly all binoculars I've tried are inherently more finnicky because of my need for glasses. Some are just better than others! I currently own some Swaro EL 8.5x42s but I haven't had a chance to try an SFs. I wish they were more easily accessible in stores that I could get just a few hands on minutes to know whether they would work for me. I would probably know pretty quickly. It's hard to just drop a couple thousand and then possibly have to deal with the hassle of returning.
I do find it frustrating when, on paper, I
should find a binocular very usable, based on spec, but find the reality to be less than perfectly comfortable, or at the very least, less comfortable than their equivalents from other manufacturers, especially at this price point.
With the SF's, I instantly embraced both the concept of the ergonomics and how they handle and operate. What I was unable to do was find that perfect setting which, once familiarity and perfect (or almost perfect) positioning had become second nature, allows you to forget the mechanics of using them out in the field. I could find no consistency, and for me there was always an unpredictability as to how we would get along on any given day (I carry binoculars for between 3 and 5 hours most days).
The problem, I believe, is that there is very little tolerance in the eyebox for anything less than absolutely perfect positioning at precisely the right distance from the ocular (eye relief, in other words). In addition, the position of my glasses in relation to the binoculars is always going to be variable to some degree, which adds to the potential to affect where I position the binoculars in relation to my eyes.
I have owned, and moved on, three of the four versions of the SF's. The 10x32's I knew instantly I wasn't going to get along with, but the other three I gave proper auditions to (months of ownership). And, whilst I frequently thought I'd mastered one or other of them, as soon as I picked up an EL, NL, Ultravid, Noctivid or EDG equivalent, I realised I hadn't, I can use all of the aforementioned reliably and with complete comfort.
I have theories as to why I find SF's so difficult to use, and used to believe I was simply incompetent, but over time have concluded they just don't work for me, sadly. Forbidden fruit!