I have a fair amount of time behind mine. Apologies for not chiming in earlier as although they are very good in many ways, there are also some significant negatives.
The good - beautifully made, excellent field of view, fairly compact for a 10x50. Great binocular to look at, if that matters to you, lots of history (what james holdsworth calls "Zeiss-ness"). NB. Focuser on mine is lighter than I would like but very positive, nothing I would describe as "backlashy" at all.
The not so good - both Oberkochen porros I own were hazed up inside (you will have found in your research that this is a not uncommon issue with Zeiss West porros, I'm sure) and required servicing, which in the case of the 10x50 took months, as even the skilled technician I sent them to advised me that he needed to proceed cautiously due to lack of spares. Even when cleaned, light transmission very poor by modern day standards thanks to 1950s era coatings, compounded by the complex optical design requiring a lot of surfaces to be so coated. Gijs van Ginkel on this site has measured one at only 60%. Both the 10x50 and 8x30 are very noticeably less bright than modern binoculars - which is not an issue for many types of observation, but unfortunately often is for mine. Other less serious negatives are the somewhat subdued colour rendition compared to modern binoculars, and a distinct falling off in performance as you get to the edge (this used to be less of an issue, but using a a flat field binocular a lot has made me increasingly less tolerant of poor edge performance), although the wide FOV helps compensate. Short eye relief is a real inconvenience, requiring me to remove my glasses/spectacles to use the binocular - (although I was aware of this beforehand, and having the binocular straight to your eyes also gives a more immersive view). I have found eye placement and positioning needs to be quite exact, more demanding than one might expect from a 5mm exit pupil.
Overall I find my 10x50 a real mixed bag of things I like and don't like. It does not have the optical performance I need for long distance spotting, but shorter distances, where the ability to pick out tiny specks isn't as essential, allow it to show its qualities and I've had some enjoyable days with it when I knew the birds were not going to fly too far. It's a pleasure to handle and to use, and I do still use it on occasion, but it's mainly a nostalgia piece now. How I wish it (and the 8x30/8x30B) had made it to the multi-coated era.
Do you still have the 8x30B and the 8x40 you posted about earlier in this thread?