in fact Windows 10 Mobile is an big step back in reliability and confidence, on the Lumia 520 my test phone works awfully bad very slow and even with resets do not really gets any better i have decided do not upgrade my new phone the 640XL to windows 10 untill Microsoft prove that can do better OS AND NOT AN WRECKING ONE , i love Windows Phone but not this awful experience of Windows 10 in "non flagships" even in an lumia 820 the performance is slow as hell and the picture quality an total mess, nothing compared with windows Phone 8.1
i think the problem there is other
the Programm Windows Insider was an very mistake , i will not pretend be favorite in my subject, but somebody knows if at MSFT are testing all the phones with 10? i think they are not, but as has millions of insiders are trusting blindly in them and the majority have not technical knowledge or even reports errors to insiders feedback or uservoice, how come millions of millions of Insiders and the windows 10 experience be the worst one in some devices and in others even be slower than windows 8.1 ? i have used in two models in an 520 and is unusable with 10 and in a 820 which gets an performance similar to the 520 with windows Phone 8.1,
i think was the biggest error this program or probably in wrong hands Apple and Android has similar programs but to get there is harder and not many can get there but looks like in there is more technicians doing their work everyday together with the testers instead of left the insiders alone.