I love these cups so very much. We still have the ones we bought 3.5 years ago. Sure, we've had a few lids destroyed by chewing, but overall, these things have lasted! We use them on a daily basis to keep milk from spilling everywhere. My least one is a true messy eater/drinker. She has discovered how to shake milk out of them, but we are working on that. We take them to restaurants, keep in the car, etc. We started using them when my first kid was 4 months old as she wouldn't take a bottle and wasn't able to drink out of a sippy cup that had a valve. They do leak if turned upside down, unfortunately. But they work great for being knocked over or sloshed. They keep down the messes and are so cheap! You can afford to have your kid chew the spout, accidentally loose one at a restaurant or park, or toss one that got lost with contents in it and then found after it molded. Great sturdy design and definitely a great price as well as flexibility. All a necessity with little kids!