Title: Leaks. Opening mechanism is unreliable.
Product review: The good: slim, streamlined design, all-steel with nice cup.The bad: the opening mechanism is unreliable, button gets stuck a lot.The ugly: it leaks big time, and it is getting worse with time. Mine is pretty much unusable after 1/2 year.Bottom line: the idea is good, the implementation looks nice but does not serve the purpose.
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