Based on my research about this device, the first thing that I've noticed is that they incorporate the style of the screen from Apple's iPhone X. The dimensions are also quite the same from iPhone X, sporting 6.3 inches and with a screen-to-body ratio of 85.2%. Screen resolution might be a little down at only 1080x2280 but the pixel density of 400 ppi will make it more brighter even if the settings is below minimum. We are all aware that brightness with a 16M colors that is displayed by the screen will have a great toll on the battery, so let's see how much percentage of the battery will be consumed by just tweaking the display to 50-70%.
OS used is the latest from Android, which is Oreo. So we can expect so many bugs and glitches along the way but I believe from previous versions of Vivo that their after market support is quite responsive when dealing with technical support. Another thing to see is the GPU and CPU performance, can it withstand heavy usage; playing online games, stream movies, download huge files, multitask several social media platforms, and operate GPS real time.
4 GB of RAM is quite a standard nowadays to the new emerging developments of mobile devices. So in this department we can see if the transitions from App A to App B is smooth and not causing lags.
In terms of Camera, I believe that this is built for selfie users also. With a 16 and 24 MP, back to front camera, this is quite good for a China phone. But with a f2.0 aperture this isn't very good at moving subjects on a photo. And I hope this camera is good in low light environment for its asking price of $359.