[Q]

For me the decision is quite clear: I buy the game as soon as possible in spite of the imperfections and bugs. But I enjoy playing the demo therefore I am pretty sure I enjoy the full game. Until now I had almost no technical problems and I get more and more used to the interface and displays, which can and should certainly be improved.
However I am also quite sure that I will continue to play SE IV as it will take a long time for SE V to achieve a comparable level of perfection and variety.