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The airflow relief valve genuinely makes a difference, I can take big gulps without that annoying suction fight. The contoured straw opening fits my mouth better than the straight ones I've had before. Been using it daily for a week and no leaks so far.

I drink a ton of water at my desk and the wider straw opening actually makes a difference, way less effort per sip than my old cup. The twist-in lock means I can toss it in my bag without the straw popping loose.

The twist-in locking straw is a small thing but it means I'm not fishing around for a loose straw every time. Wide opening makes it easy to actually get a decent sip without fighting it. Only had it a couple weeks but it's already my go-to cup.