I am not exaggerating but it is true that the zenphone produces more heat than a solar panel place in sunlight.Many customers buy this product because of the successful story of INTEL in the computer world. But the results is quite different from what we expect
Battery
Poor performance. In my experience, with full battery I joined railwifi I thing within one and half hours phone shut off. At firt I thought this is a battery problem and I assisted the shop owner, he told me that this common problem.
Sound system
Unlike other phone oF the same price range this phone has very low sound and it requires a earphone to hear a music/video clearly.
Updation.
Phone is in built with android kit cat and not possible to upgrade as it is not given.