Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't spill because nothing comes out!

I have two of these cups. I've done everything to make the milk come out faster but even when I suck on them milk or juice just dribbles out. When I totally take out the insert fluid just pours out non stop but when you put the plastic insert in hardly anything comes out. I tried cutting the hole in the insert wider but that doesn't work. Very frustrating cup. I wound up switching back to the Munchkin Mighty Grip. Works great.