I was using OnePlus One! which is still a good phone.
When I started using OnePlus 3 I feel like it is 2 times faster than my one plus one.
But real life difference is much less. But I love the faster app opening etc. everything is QUICK and fast.
But still I can live with my OnePlus One for sure. OP3 is not a Can’t live without it or Ground Breaking device.
Problems:
Too Slim, Easy to drop! , Slippery AF, Camera is Good ( Not a Flagship killer camera [better than OPO]) , Speaker placement ( Bottom firing) , Oxygen OS ( It is clean but I miss few features on CM13 on my OPO)
What I like the most:
Dash Charging Speed.
OLED display.
Finger print reader.
Everything else is not the important for me. I feel not that much difference from OPO.( day to day usage [normal]) . DASH + OLED + FP SCANNER itself is a good reason to upgrade. but not necessary!