If you're looking for a new phone, then hell yes, it is worth buying.
OnePlus 5 is really a great device, and apple has not launched the new iPhone yet.
OnePlus smartphones are traditionally one of the most interesting solutions on the market. It is indeed the "killer of the flagships" - a powerful "hardware" with a huge RAM volume, and the lightest and smoothest Oxygen OS shell based on the latest available Android version.
Performance
Users of OnePlus 5 can be sure that nothing more technically advanced than their device will not be presented until the end of the year. It has a powerful 10-nm Snapdragon 835 chip with a peak frequency of 2.45 GHz, 8 GB RAM and 128 GB of storage memory of the newest generation (the most productive and energy efficient), a proven AMOLED-display with a resolution of 1920 x 1080 pixels. All significant competitors offer similar technical characteristics, but would be good if they have 6 GB RAM.
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Design
It is impossible to notice the similarity of OnePlus 5 with the iPhone 7 Plus. Looks like a copy eh? OnePlus 5 is good from the point of view of ergonomics in the sense that the fingerprint scanner is located on the front panel.
Battery
OnePlus 5 got a battery of 3300 mAh, which, with an AMOLED display with Full HD resolution and a super-efficient chip should show excellent results of autonomy. With optimization, the device can become the absolute leader in this factor. In addition, the hardware component of Dash Charge technology was added, which managed to showcase its effectiveness in older One plus models as well.
Support
OnePlus 5 works out of the box on Android 7.1.1 Nougat and will definitely get the firmware based on Android 8.0, because the company confirmed the release of Android O for its predecessors. In addition, the very firmware is frequently called the best on the market. There will be no more smartphones from OnePlus this year, so the attention to the software will be more than enough.
Price
OnePlus 5 is significantly more expensive than its predecessors, it still remains one of the most affordable flagships on the market. The price of 560 euros or ~38000 INR for the maximum set does not seem so huge in comparison with iPhone 7 Plus, Galaxy S8.
Conclusion:
With all those salient featured, it steals the show which is why its the best seller phone today.
With a whopping 6K reviews, it is really ruling on Amazon.
Source: Quora,Google,Wiki