Just brought my one plus 3T a month ago month before.
Durability - Drop test from 8 feet without any phone cover some scratches on the screen back is perfect.
Battery- A good 3400 MAh battety lasts all day, with video streaming, gaming, surfing and songs for sure.
Updates-The lastest updates are always on the way to this phone. Nougat update is absolutely stunning on this device.
Performance- A 6GB ram can hild lots of aap and keep them running for a long time and snap dragon 821 processor 2.3Ghz. Its fast you know.
Worth it- Absolutely it got all features which a double amount phone’s don’t have.