Instruct: Classify the given review into positive or negative sentiment.
Query: Great cups, bad seller.

I ordered four of these cups because I own one and my 10 month old can drink from them easily. They do not require excessive suction and for the most part they don't leak. I had a hard time finding them in the store so I was excited to find them on Amazon.hen they arrived, however, they were coated in some kind of nasty grease. I am not sure if they were used before, but they certainly needed extensive cleaning before even considering for use.In short, I recommend these cups highly as a more substantial alternative to the 'take and toss' cups that leak, but look for them elsewhere to get a shiny new cup.