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The airflow relief valve actually makes a difference, no more fighting to get liquid up the straw. The wider contoured straw is easy on my mouth too, I've been sipping water way more throughout the day because of it.

The contoured straw opening is wider than I'm used to, so I can sip without puckering up like with my old cup. The airflow valve really does make a difference on thicker drinks. Been using it daily for two weeks and no leaks so far.

The twist-in locking straw is the best part, no more fishing around for a straw that fell inside. Only gripe is the lid takes a bit of muscle to twist on all the way. Solid for the price, I've been using it daily at my desk.