Last weekend I then participated in a silver / goldsmith course and had thereby the loupes. I have long two and a half days, worn almost non-stop (the longest day of the course went from morning 9:30 to 17:30). Amazingly, I had no complaints at all. Nothing has pushed and I could carry the microscope easily until the last second.
Several course participants were so enthusiastic about my loupes that they are now also an order. Even with the high shipping incomprehensible this magnifier is a bargain and I would buy them again at any time.