I am using this phone since last 1 year. it is a good phone. I have a heavy phone user. generally I will use any phone maximum 4 to 5 months only. but I am using this phone since last 1 year without any problems. especially the battery backup is awesome. compared to the v11 pro also this phone is good in battery backup. obviously this phone is not having super amoled display that is the reason the battery backup is more efficient than v11 Pro. in the camera view in some angle v11 Pro is best. but in many areas like Daylight, full light both cameras are same. but prices so much difference between these two phones. actually I purchase v9 at 23000 cost, but now you can get this phone in online deal roughly 14000 to 15000. where as v11 Pro is more than 22000. so comparing with the price also Vivo v9 is the best phone. my friend is using v11 pro. but he is facing the battery issue. the battery is draining very fast.
so if you want a best performance phone you can buy this phone without any thoughts.