I have big experience about vivo y51l. I am using this mobile phone from 2016 .its main disadvantage is its weight and battery backup. Mobile has short time battery backup.when I using mobile continue 1to 2 hrs with youtube and gaming it get heated. Its battery backup 2300 mh which is lowbin now a days. Its weight is more, small size screen , less internal memory due to this I don’t like this phone.it has great network problems. It has not fingerprint sensor. Its look also bad.
Sometimes phone become hang automatically. Mobile cost is more but less feature
My opinion about this is, you should not buy this mobile.
Thank you