I bought this phone a week back and updated it with official windows 10 on the first day and it working excellent not noticed any lags till now even though I have downloaded around 50 apps.
If it is android with 1gb ram by now it would have struggled even to open.best phone for reading and entertainment with excellent battery backup.problem is though all the important apps available the problem is with the quality of apps and unavailability of google apps for windows if these problems solved it can finish android.