This is a Good game, CD Projeckt have done more than most AAA companies bother to do to make it right, GOG is a solid platform with excellent support, I have many games through them and never had any issues, I see some users have complaints about no refunds, which tells me they bought it NOT through GOG but another seller,

Great Game, great service and price, very pleased with my first purchase via this service.

note Mods can break games, they are not made by the programmers nor made by the studio, they can work for some and not for others, this is the way of Mods. not the Modders fault nor that of the Dev's if you use mods YOU do so at your own risk.