I am very pleased for you that you had a chance to compare two instruments and weigh up and dispel your doubts. I have never had the privilege of looking through any 12 power binoculars but your photo shows they are at least very attractive on the outside: a beautiful design with a classy finish. (I know the word classy isn't itself very classy!)
Let's hope you get many hours of happy strain-free viewing now that you have had a chance to 'hand grade' the different specimens!
PS I'd be very interested to know how you find the 12x50's size and weight; do they take much getting used to in practice? (Sorry if you have mentioned this before - I haven't read the earlier posts for a while now as I think the thread has been running for some time.)
Sorry for the somewhat tardy response!
I don't personally find the size or weight a problem, but I suspect it will very much depend on the sort of viewing that you're doing. Additionally, I've come to the conclusion that I don't hold binoculars in the generally common manner. For many years my only bin was my trusty (and still very lovely to use) 10x25 BCA. I have fairly large hands (or at least long fingers) so I always held those with my right hand nearer my face (to operate the focuser) and my left hand further away, so that they didn't interfere with each other too much. I have transferred that hold to all of my larger bins including the 12x50, so I get much greater stability (I believe) and the weight is more evenly distributed between the hands - the right hand supporting the ocular lens end and the left hand supporting the objective lens end. I hope that helps!
I know (IIRC) that you also only had the 8x20 (BCA or UV?) for years, so perhaps you can relate?