I am using my Vivo S1 for more than 2 years and I genuinely loved it.Currrently I am using ths vivo s1 for writing my review also and in my opinion it is a nice phone.
Build Quality: -
The vivo s1 was build with small nano fibers with some plastic and I think the build quality is quite aooreciable in my views.
Battery Backup: -
This phone comes with a very nice 4500 mAh lithium battery and also it comes with 18w fast charging .
Camera: -
The front camera is very nice with a 32 mega pixel indepth camera.Also it has 16 mega pixel back camera.
Perfromance: -
It comes with P65 octa core processor with a clock speed of 2 ghz which is coparatively nice.
Value for money: -
I have 4gb RAM 128 gb ROM variant and I had bought this phone for Rs-19990but according to my opinion only the back camera is nice and only this is a key problems in this phone otherwise Vivo S1 is a very great handset.
In my opinion anyone can buy this handset and they will never regret