Sword of the Stars II (SoTS2) should be a must-buy for any fan of PC strategy games. In time, it may well become just that. As of 2nd December 2011, however, the forums are still filled with long lists of bugs and crashes - lists that are far longer than one should ever see for a game that was released for sale to the general public a month ago.
Kerberos, the game's developer, and Paradox, the publisher, have a very well-established record for sticking with a product, continually improving and expanding it. I believe that they will do that with SoTS2 and that, with a little luck, SoTS2 will one day stand with the very best of its genre. But not yet. Important elements of the game are disabled, some parts are bugged to the point of having no impact on the game and others actually cause it to crash. This, when linked with what is currently the most user-unfriendly UI in the history of 21st century PC gaming, would force me to recommend patience with this one. Check the forums before buying!