I bought OnePlus 3T last month(Jan 2017) and it been one month I am using this device. I must say I am satisfied with money I paid for this device.
Battery - Earlier, I was using Moto X2(already shared experience) and it still a good device with only problem of battery drain. Even on normal usage, I have to charge it twice a day. However, with OnePlus 3T, it easily last 24 hours with having 30% battery left. SOT was around 4h30m(on average). Standby is awesome on this device. If before going to bed, battery shows 30%, it only drain 4-7% in night and you will still see power of around 25%. I am using two sims(both 4G) with round the clock volte enabled. I am not heavy game user but keep my emails, whatsapp, facebook feeds, weather update, news update keep syncing all the time.
Network Quality - With jio sim, I faced few issues in calls like, call disturbance, breakage but that only with using jio sim. With Vodafone, I never face any issue with call quality. So yes, call quality is good on this device.
Processor and RAM - Here, I face few issues. Sometime phone stuck with animation on going back and forth to main screen and applications but that was only 5 times out of 100 so 95% times there is no issue. But this is not something I would need to worry. With having top of the line processor and 6GB ram, it never let’s you down.
Screen Quality and overall build - Look and feel of this device is really good. It feels a solid phone. Although it is having 5.5 inch screen but OnePlus tried to keep bezels thin so it wouldn’t feel a big device. Screen quality is also very good. You can easily notice difference by keeping side by side FHD device.
Finger Print Scanner - This is really fast and works 98% time correctly. It also more depends on which finger you use mostly to unlock device. I am not sure but it might keep history and that why recognize it instantly of most known finger.
Camera - Rear and Front camera and also good but not The Best camera in mobile phone. As like any other camera in phones, it delivers good picture in day and natural light but struggles in artificial and low lighting. Manual mode is really a good feature but only when you know how to play with it.
Slider - This is again a very useful feature. It might take some time to used to it but once you start using it, you will find it very useful in switching mode from general, don’t disturb and silent.
Overall Experience - Impressed and must buy if your budget is around 30K. This will easily last at least for 3 years( and mind you that’s good figure keeping in mind we see new phones every day with new features).