I’m using this phone for around 5 months.Well I purchased it from Amazon India. I never face any issues with my Oneplus One.
Oneplus is providing snapdragon 801, 3gb ram 64gb/16gb internal memory. So guys chill, you will never run out of memory and ram. Sanpdragon works like a charm.
Secondly Sound quality of this phone is amazing.
Third Camera is quite good in this 20k price segment. Please don’t compare oneplus one camera with S7 /G5/oneplus 3.
Buid quilty is also very good. Oneplus is providing gorilla glass 3 with this phone.
Also you can connect pendrive, hard drive, usb led bulbs, usb fans though otg adapter.
As an android developer I can say that it is the best phone for android testing and development. There are tons of good Roms are available for this phone. Never worry about latest google adroid new version. Because you will definitely get latest one.
So just go for it without any hesitation.