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Title: Don't waste your time
Review: I like the Nuby sport sippers without the straw, but the straw version is terrible. It is hard to put together, leaks badly, and I would not recommend it to anyone. I have the playtex quickstraw cups, and they are 100% better. If you are looking for a durable straw trainer that doesn't leak and is even insulated, go that route. You can also buy replacement lids for most of your playtex spout sippies to convert them to the straw kind. Don't even bother with these, the Nuby 3 step bottles are okay but the straw ones are very disappointing.
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