I had some complaints on Zeiss eye cups, earlier.
http://www.birdforum.net/showthread...&highlight=cups
I hear they are now improved.
Eye cups are the most used part other than the main hinge of a binocular. You should test them for wobble. My Monarchs had some wobble and if you twist them off their normal course, they could go off track even.
My Pentax SP 10x42 are pretty good and so is the Legend 8x32 in the photo. The Legend 8x42 has the same. Both have click stops.
Vortex Viper, top in the photo, has less lip, but still fairly comfortable. I rest them below my eye brow on top, I cannot push them against the eye socket completely. This Viper developed a problem where the plastic cylinder the cup screws into started to rotate. I can still push them in and out. Screwing just rotates in place. Will try the "no receipt" warranty service I guess.
Bushnell Excursion smaller end models have a rubbery layer of the eye cups glues onto a metal frame that goes in and out. the frame is OK, but the rubber layer can come loose, it is just glued on.
High end binoculars have reliable mechanisms, but some of them also are uncomfortable.
The most comfortable eye cups on porros I have seen are on Bushnell Legend 8x42.
The worst twist-out eyecups I have had were on Nikon Monarchs 8x42's. The best I have had were on Nikon HG 8x32's. It's amazing that for a little more money Nikon CAN make good cups. The rest Zeiss, Leica, Swarovski are in between. All pretty good. I did have some bad ones on the last Leica 8x20 BR compact I had. One side of the eyecup was a little loose and it would go in a little when you put your eyes up to them. Not good!
Dennis