Worthless.
After five years since the release of the main game, the devs STILL didn't released all of the promised content.
Just a few months back they "released" German campaign, but it feels like it is still in the beta (complete lack of voice acting and a lot of bugs). Russian campaign is still nowhere to be found and after delaying it a couple of times, devs stopped releasing any announcements, so it most certainly won't be out this year.
Save your money for something worth it.

Worthless. After five years since the release of the main game, the devs STILL didn't released all of the promised content. Just a few months back they "released" German campaign, but it feels like it is still in the beta (complete lack of voice acting and a lot of bugs). Russian campaign is still nowhere to be found and after delaying it a couple of times, devs stopped releasing any announcements, so it most certainly won't be out this year. Save your money for something worth it.