Hi.
There are a few problems with with god feature....
Once it is turned on, then all animals will be invulnerable and in god mode too!
So there is no way for hunting any more!
This goes for zombies as well... They are in god mod too as long as they don't attack you. Once they start attacking towards you then they start loosing health too, so pretty much attacking them from a distance with a sniper rifle or sneak attacks using close-in weapons are not usable anymore.
When activating premium feature, not all the premium rewards will be claimed even if you get them they don't go into your inbox this is specially noticeable with coins and energy drinks.