I am using the phone since 2014. It runs on windows 8.1. Its OS is very simple and easy to use. The main problem is that the windows 8 store doesn’t have most of the apps. It doesn’t have the front camera also. And the phone hangs too much. But I can say that the product is well built. And it only have a 1430mAh battery. So if you are a heavy user you will need to charge it 3 times a day.
So, in a nutshell the phone is not value for money. There are lot of other options available at this range.