OnePlus One's appeal lies in its hardware.You'll have a very hard time finding anything else that delivers the same amount of power at this price level. It all begins with a top-tier Qualcomm Snapdragon 801 SoC, which has four CPU cores running at 2.5GHz and an Adreno 330 GPU. That's matched with 3GB of RAM and 64GB of storage space
The 5.5-inch 1080x1920-pixel display has its touch sensitive layer fused to display panel, which OnePlus claims makes the screen far stronger than the common OGS (one-glass solution) method of production. Brightness levels are quite good, the viewing angles are better than that of the LG G3, and contrast and color reproduction rivals that of the LCD on the One (M8). If you don’t like the look of the display out of the box, CyanogenMod lets you customize the hue, saturation, contrast, and intensity. In the images below, you are looking at the OnePlus in “Vivid” mode.
The build quality of the phone is good & can withstand shocks which is a lot better than phones within this range like LeEco, Micromax.
OnePlus One runs on CyanogenMod, one of the world's most popular alternative Android distributions. Based on the Android Open Source Project (AOSP), CyanogenMod promises a whole host of features that go beyond what even stock Android delivers, such as themes and configurable UI elements, improved privacy controls, root access and performance tweaks.
It comes with 3100 mAh Lithium Ion battery which fairly last for complete day.If you are looking for a battery beast, the OnePlus One is it. It has a screen time of nearly 5 hours, 56 minutes which is pretty good compared to other phones.
At ₹18,999 (64GB, Sandstone Black), the OnePlus One is without a doubt the best value in tech.