I gave it to my son
He is thrilled to be able to use it for his work in the workshop as well as for his many telephone calls.

No idea about the Zurich area. What you see on the Internet is a good reflection of what these headphones are. If you're looking for good sound, you'll have to look elsewhere.

Nope just bought them. So cannot help you for Zürich. Living in Geneva.

At Mediamarkt they have

Hello Ruby
Unfortunately I don't know where you can test them in the Zurich area. What exactly do you want to test? They connect to devices via Bluetooth. Since my wife and I got them we only use these headphones, they are great for sports and everyday life. Absolutely waterproof for splashing water (so no problem with rain or sweat - I've never tried swimming with them, don't know if they would withstand that). But they are great for talking on the phone, we only use our mobile phones with them (you can hear well and the other person can also hear very well and clearly). On the train to work, during sports, at home doing the housework (even while vacuuming) the headphones are used well and a lot. The battery lasts for at least 7-8 hours, even after years of use. They are relatively robust, but you shouldn't sit on them. Unfortunately, one of them broke once (we bought a new one shortly afterwards). The bag that comes with them is great, it protects the headphones very well.