My Nocts 10x42 are superb in all areas, if i've been out, or on holiday, Turkey x2, i always clean the glass with the power of running water, dislodges dirts easily, and never have had a problem.
If posters want to voice their concerns about the product, so be it, no Dramas......
The experience of users of the same products can actually be quite different from one to the next, something that has surprised me time and again, esp. if we talk about expensive binos.
I happen to own a substantial number of what is sometimes called „premium“ binoculars, and if I had to „measure“ the reliability of products by counting the number of times I had to send an instrument in for service or repair during the last 10 years (note: I am NOT abusing my instruments, quite the contrary), then Zeiss and Nikon would be the best (1 count each: replacement of grey SF due to focuser problems; fixing collimation in EDG), Leica would be second (2 counts, decollimation of compact 8x20 and malfunction of Geovid), Swarovski would be third (3 counts, 1 fixing collimation in SLC 15x56, 2 fixing focuser in EL and SLC).
Luckily, the responsiveness and service quality has been good for all four producers and their service centers (including Nikon Switzerland).
The above is true for binoculars currently on the market. If I try to figure out how this is different to the experience with binoculars 30 years ago (yes, I happen to be what they call „of advanced age“), then it seems to me that reasons for service have been shifting. If I had to send in binoculars like Habicht or Zeiss 8x30 (roof) for service, that was mostly due to „internal fogging“ and the like, an issue that I have not encountered with the more recent sealed (and nitrogen purged) binos. On the other hand, focuser problems were not an issue at the time, and I find it somewhat annyoing that it is apparently not easy even for the „best“ in the market to assure 100% reliability with today‘s sophisticated internal focusing mechanisms (judging just that aspect, Leica would come out first for me, esp. their Ultravids have never let me down in this respect).
Maybe one or the other forum colleague will understand why I still hold the good, old external focus porro design in high esteem ...