Instruct: Classify a given Amazon review as either positive or negative.
Query: Great Cup

I have a sleeping disorder and have broken many coffe cups and stained even more carpet and furniture by falling asleep with my coffee in hand. I tried many other cups and while the breakage was easily stopped the spills kept comming. With this cup I am so happy to say I have not spilled a drop. I fall asleep with it in hand all the time and no matter the position it ends up in it has yet to leak. If there were a negative side to this cup it would be the nasty slime worm it can develop in the lid. I was not aware of the problem and used my cup for long periods without doing any more then just a quick rinse. I dink ALOT of coffe and almost always have a cup going. I found out the hard way that you MUST clean this cup after every use. If you dont it can develop what my wife and I have named the Slime Worm. Basically a nasty slimmy worm shaped build up that dislodges itself once its big and nasty enough to make you vomit. Seriously though the cup rocks just keep it clean.