a little leaky
When you fill the cup and tighten lid, the straw fills and leaks. Though this doesn't happen after you take a sip from it, it is annoying. Would also be better as an 8 oz cup. Child likes, and overall ok, but for the money, the weighted straw munchkin cups are better.
ProsWeighted straw is awesome.
ConsLeaks on initial fill up and if tipped upside down.