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The twist-in locking straw actually stays put, which is a nice change from the loose straws that always pop out of my other cups. Sipping takes almost no effort thanks to the wider contoured opening, so I end up drinking more water during the day without thinking about it.

The airflow relief valve makes a noticeable difference — no more fighting to get liquid up the straw. The contoured opening is wider than my old cup's, so sipping takes almost no effort. Been using it daily for two weeks and the lock hasn't loosened once.

The twist-in locking straw actually stays put, which was my main gripe with my old tumbler. The wider straw opening makes sipping way less work, and the airflow valve means I'm not fighting for a drink. Been using it daily for a couple weeks now.