Loved this cup at first, but it consistently leaks from the straw if the cap is on too tight, or it gets bounced around in the stroller, or it's been stored in the fridge and taken out again. Has to be thoroughly scrubbed if you're using with milk, wouldn't recommend for smoothies. The actual ergonomics and weighted straw design I've been happy with, but oh what a mess. And the straw recently split near the top so we've had to cut it shorter. Would not buy again.