I got HTC Desire 820 Dual Sim in May 2015.
Initially the performance was good. But now, the battery cannot be utilized for even half a day. It gets drained completely if you open any high end games.
Mobile gets heated very quickly if you work on huge apps/games.
On the pros side, it has an LCD capacitive touchscreen, 16M colors, Qualcomm MSM8939 Snapdragon 615 Chipset, 13 MP, autofocus, LED flash Camera.
But the performance is slow and not upto the mark.
The Corning Gorilla Glass 3 Just shattered when the phone slipped out of my hand.
Not recommended if your internet is on all the time.You have to recharge to 100% twice a day.