I attended one of their events a few months ago in Amsterdam. You have to hand in your phone when entering the venue and get it back afterwards. I spent around 2 hours reading my kindle in silence. It was really nice being in a space where everyone had put their phones away, but paying 10 euros for the privilege of doing so means I'm unlikely to turn up regularly when I could just go to a cafe and put my phone on airplane mode for free.
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