The result after updation is worst. This variant losses it's performance after getting Oreo update. First major part is battery performance. The time required for charging goes beyond 4 to 5 hrs. from 30% to 90%. Second one is major i.e. draining of battery. Also, some are facing problem related to camera, appearance, stucking operation during operating etc.
This is regarding to Samsung Galaxy J7 Max. This variant may not get Pie + OneUI update. This is bcoz of the processor used in it (Mediatek Helio 2.0). The Mediatek company is not interested to update their driver, causes no updation for the model. Samsung promises to work on it & may try to get the update for this variant up to Dec. 2019.