Somewhat better

Original review: Server has been quite stable and the game crashes less. However the tracker is still broken and the game is becoming less and less enjoyable
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V1.5
Tracker is still not functioning for everyone after they made it available to certain players to test the new tracker (maybe three weeks already?) and theres no word on when it will be made available for everyone. Appraisal feature is nice and the upcoming walking with a buddy Pokemon feature is gonna be very essential.
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V1.39.0
Ever since the gym rework, the game crashes so often when played on iPhone 6 Plus. Several clicks on different gyms or feeding a dozen berries is all that takes to kill the game. When I turn off the phone screen it crashes too, so now I cant even save battery by only using the Go Plus. Please Niantic, other features are great but the game needs to be optimized for older phones.
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V1.39.1
This game does not stay open if switched to another app or turned off the phone screen when background app refresh is turned off. Quite disappointing since the update was supposed to fix crashes on iPhone 6.
Moreover, decreasing graphics performance is not a hot fix to the game (and will plenty of crashes like before), now the Pokémon look worse. And please add an option to disable go plus notifications for Pokémon caught/ran and items from stops.

j-ace1990 about Pokémon GO, v1.39.1