I have a Samsung ATIV S and I got 10536 then hacked the registry to get 10586.29. The performance-wise is really a huge improvement over 10536 and close to 8.1 gdr3. Battery drain a bit faster than 8.1 but improved a lot during standby, I can get almost two day battrey-life under light usage through my two years old battery and that's kind of impressive. The store is faster to response (able to use it without getting rage lol), yet still easy to get error code if you just lock the screen during download and I guess it's something to do with the strict power governor. I don't feel much change about the quantity and quality of apps, still there's a lot of old and ugly apps looks like coming from the age of iPhone 3g/HTC hero stay on the top of free/top rating apps list and it's just disgusting to even look at. However I do love the new UI over the old one, the transparent tiles/4 volume layout/font makes it more mature and polished. With the UI change from swipe to hamburger/swipe/whatever mixed style, the apps seems not ready to make a full use of it and sometimes slow down the operational flow. However the edge browser sucks at both w10/w10m, lot of reloading/no response in some heavy-loading Web pages (like this site, it's painful to use through edge). Third-party browser blows edge away easily.
Overall I feel it's ready to be a daily driver, yet I don't feel much difference over 8.1 in terms of UX. Not sure it's a good sign of not.