Mjduct-I was concerned about the "rolling ball effect" as I have always been very susceptible to motion sickness. However, I've spent many hours over several years panning lots of western landscape on elk hunts using a Swaro10x42 EL. No problems whatsoever. I know little about the technical aspects of optics and continue to wonder if this effect is real or something that has been played up and exaggerated by Internet optical experts.
Its been exaggerated to no end..
I've sold hundreds of pairs or swaros, leicas, etc, in the real world, less than 1% of users actually notice it. Of that 1 % 99% don't notice it in the 50's.
