Vivo s1 is very very good product in this price. The sound quality is awesome, and look is vey slick and stylish and back of with colourfull glasay finish with gorila glass protection. In this price segment no one product come with in display finger print sensor but it's come with in display finger print sensor wich looks very stylish and it works very fast. Although it comes with large supper Amoled display with water droplet notch. It comest with rear tripple camera. The rear Camera was awesome and many options are available in camera. Also the great 32 mp front camera. The dront camera is awesome and click very beautiful photos although the clarity of broken mode is incredible. Overall the battery backup was very good because it comes with 4500mah battery backup. And it comes with also fast charging. But it look so beautiful gorgeous glassy finish. Even though the face unlock is very decent and works properly. And the media tech helio p65 processor which gives you a smooth and hd gaming quality.
The model comes with 4gb ram and 128 gb rom
And 6 gb ram 64 gb ram and 6gb ram 128 gb rom.
Overall this is best product that you buy in this budget because I also use this phone à t 3 months and I play high resolution game all the time but the phone works smooth and hang free.
So I would recommend to buy the mobile it is such value for money.