Ya win some ya lose some ...they certainly do leak.. But i couldnt get my daughter to take a sippy cup with a hard top... Its a great transitional cup even though it leaks.

I like how they are low priced but they leak/spill. When I was cup training each of my daughters they usually ended up needing their clothes changed and a bath because the cup would leak all over them while drinking from it. Also I don't/didn't use them very much because of the soft spout being so easy for my teething daughters to chew holes into and eventually chew chunks out of the spout. All in all for a cheap sippy these are good,but for spill proof...not so good.

I buy them for the car rides with my daughter, she can chew the plastic lid after about three uses. However they are cheap enough that I can just throw them away and dont have to panic over them like some of her other sippys. Also great for the grandparents house.

We bought these for my son to switch him off his bottle. Theyre cheap in price but still leak. Whichleft my couch many stains:(

Not exactly no spill. It can leak quite a lot and if you don't put the rubber piece back the exact way it is even worse. my son did take to it quickly but it was to much of a mess.

I like how they are low priced but they leak/spill.

I tried this with my son and i was surprised he started sipping at with no problem. But the only thing is that it still leaks.

Works great, durable, and very affordable.

I like the look and feel of these, the colors can be for boys or girls. They are every easy for my baby to hold. If left upside down, they will leak but i have not had any problem with the nipples tearing or anything. I did have to bleach them though because they got stained after just a couple of uses (my daughter only drank water form them but they seem to collect color from whatever is being washed in the dishwasher).

This sippy cup, is how I get my kids off of the bottle before they are 1. I would rather it leak a little, than my kids to be 4 years old walking around with a bottle!

These cups are absolutely amazing! The only downside I have noticed is that the seal around the top seems to wear out after so much use, but for the price it is well worth it!

I had a very hard time getting my youngest to change from a bottle to a sippy this was the only sippy she would use.

I really like these for my daughter. It is the perfect size for her to hold and if it does leak, it's very little.

My daughter loves these cups but if your child likes to chew on them they wont last long. On the other hand they are cheap in price.

I loved these when my daughter was a baby, she was exclusively breastfed till 10 months and wouldn't take any bottle or sippy cup except the nuby brand. I had no problems with them 3.5 years ago. I've bought them for my son who is 11 months right now and he is a very curious baby and loves to bang these on the floor and squeeze the nipple so of course there is some spilling. He loves to drink from them, just wish he didn't want to play with them more then he drinks from them.