I am using mmx unite 2 from past 1.5 Years. An awesome phone in economic price.
It has all the features one wants in a smart phone. Camera, sound, design.all are good. It has 8gb storage space but only 0.89 Is available for app installation. But this can be solved if u google. I have 3.5 Gb apps installed in my phone running flawlessly.
I even upgraded it to lollipop but was unsatisfied. In lollipop I faced dialer touch and ext sd card writing issue to. Lollipop in this phone does not use your memory card as your default memory. This is why people face memory shortage in this phone. But if you are little technical like me, there is always a solution.
As of now I downgraded it to kitkat and very satisfied with the same.