Mikael Krogerus is freelance journalist and an editor with Das Magazin, the weekly supplement to Switzerland's biggest newspaper.
Roman Tschäppeler is the founder of the consulting and multimedia firm Guzo, based in Biel-Benne, Switzerland. He attended the Kaospilot School in Denmark.
To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
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