I love just about all of Avents products. We have used them since my daughter was born. I saw a lot of reviews stating these cups leak. We have been using them for 2 weeks now and I haven't had any issues with leaks. I did everything I could, short of throwing it across the room to make it leak and it didn't. My daughter isn't abusive to objects so she doesn't throw things often. I would say that if your child throws things when angry than you might have an issue as there doesn't seem to be much holding the leak proof plug in. One good fall or throw to the ground and it could pop out causing it to leak from the spout. Other reviewers were mentioning leaks from the rim though and I haven't had this issue. The cups are a good size, they are comfortable for my daughter to hold, easy to clean, and the little cap to keep the spout clean during travel is nice. I also tried the cup with a Avent classic lid and nipple and it went on great with again no leaks. I wish they made their 9oz bottles this short. I wish I had this cup sooner. I love that Avent cups and bottles can be used in conjunction with one another. This has been a good cup and will fit the needs of any age from beginner to toddler.