Energy saving chest

The chest is impeccable and very energy efficient with security. I can not understand that some reviewers presume with partly pseudoscientific milkmaid bills and home improvement instruments to doubt the power savings. I wish to use my 20-year-old freezer the Lousy Petern. This is still a real power guzzlers.
Only criticism: In a 400-euro Bauknecht-chest, I expect a decent manual. First, the layout is impossible raggedly. On the other hand one can not see anything on the few pictures, because the pressure is so bad. Moreover, I suspect that the supplied manual belongs to another model.
Update:
Now I know it is safe. The included manual is for another model. Got the correct instructions on the Bauknecht website downloaded and printed out. So it should not run in an expensive Bauknecht Chest. Therefore, a star deduction!