Instruct: Classify Amazon reviews into positive or negative sentiment
Query: ups and downs

The circle part of this devices works perfectly. The majoy flaw is in the "pen". THe pen is, honestly, a peice of plastic junk. I do not typically write harsh reviews, but this thing is bad. The pen does not hold the blades well and breaks very easily. If the per were made of metal of some sort this would be a far better product.