I love these cups and I like how Playtex does different stages of cups depending on the child's age.  They can be expensive, but they last for a very long time!  I haven't had to buy any replacement valves for it, but found that they are durable, can go in the dishwasher, and best of all, it doesn't leak!  It not only saves my carpet but my car as well!  I can toss the cup into my purse and it can fit right into the cup holders in a car.  I am always on the go so these cups are great.  It's easy to wash either by hand or in the dishwasher and they come in fun designs and colors.  As I said...