I own 2 BCE's:
1 with a Asian 7750
1 with a Swiss 7750 (genuine movement not bought from China, done after the fact as a mod)
Overall there is no cosmetic difference.
The differences lie in the watch's function/performance only and there is nothing wrong with the Asian's performance inmy experience.
Time reserve much different, Asian lasts about 1/2 as long as the Swiss when not worn, Asian version crown and stem action is not nearly as smooth, the date change at Midnight is not the same, often have to adjust the date via crown to get the Asian version lined up perfect in the window-though I am anal about the dates lining up.
Is that worth $700 more no way.
Is it worth $300 more, maybe depends how much you like the watch.
I would get the watch with the Asian and if you love it and want to improve the performance and feel of the functional parts, swap to a Swiss later.
I would rates mods to a BCE in the following order (1 of my 2 has everyone of them, except for #7)
I am not saying these are worth the money, just listing the value of the mod on this watch basedon visual differences primarily.
IMO the top 4 are worth , the last 3 probably a waste of money. Shows you what I think of the Swiss 7750 upgrade I think.
1.) Datewheel (v3 has perfect datewheel other versions need aftermarket datewheel)
2.) AR (newer versions have better AR but still not perfect, Chieftang double AR is the answer)
3a.) Relume the dial and hands - not only for luminisance but also so the color matches. Many reps come with mismatched color on hands vs. color on dial markers when not lit up, this is not a good thing.
3b.) Gen Dial -eliminates need for relume of dial of course, half tick issue solved and in general a shaper appearance.
4.) Gen croc strap or a gen bracelet (croc strapmy preference and much less expensive and easier to source)
5.) Gen Bezel -new v3 the 30 tick is off center, not too big a deal but gen bezel is better overall.
6.) Swap movement to Swiss 7750
7.) Gen Hands - not really needed and this is the last possible mod and not one I will likely do.
Cheers,
M