Ok but not the best I purchased this cup for my niece and it's pretty ok. The major issue that I had with it was she is still often a tipper and when it is tipped the slightest they don't get anything out of it.

So far I loved it! This was my son's first sippy cup that I bought for him, what made me try it out was that the straw wasn't plastic so it wouldn't poke him hard inside the mouth and that the lid covers the straw when it wasn't in use, my son didn't have trouble with that at all but if the lid happens to break off, whatever liquid you have in the cup will slowly go up the straw and leak.