I bought this phone almost 3 years back and I am so happy to use it . it is still in perfect condition . never used scratch guards abd cases . Its battery is still good and gives me a day charge with normal use . The volume performance has got little slow and the phobe got heating issues if played games for 30 mins continuously. But still I would say it as a best phone becauee it last long enough. It is the best phone in oneplus series after oneplus3. I had no complaints with it till 2 years of regular use as my primary phone .