Is the Kia Seltos' infotainment system all it's built up to be, or is it just a big flash with no substance?

One of the selling points of the Kia Seltos is always cited as its advanced infotainment system. The goal of this question is to assess the real world usability and functionality of this system apart from the marketing claims. It discusses the user experience with the interface, connectivity features, responsiveness and integration overall with the rest of the vehicle's system. In addition, the comparison is made of the infotainment system with those in rival vehicles and the extent to which it adds or subtracts from the overall driving experience. Since modern car buyers are increasingly putting tech features and connectivity at the top of their purchasing decision lists, this topic is especially relevant.