In store testing and I liked ths Zeiss. Got them out in the field and they just did not work for my eyes. I always had eye strain and actually found that I was regularly not looking thru the optics to rest my eyes.
That's what I found and why I moved on from the 15x56 zeiss, just something didn't fit right for my eyes glassing with them sometimes. I still have my 8x42 conquest in the lineup as I have kids about to hit hunting age so no point selling those off, those never bothered me.