Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 2 units later giving up on this product

Although this product is appealing as far as what it says it can offer, we have now tried two new units which were both defective. The first unit did not recognize the stylus at all so we returned it. The second unit now does not recognize the correct page. I was very excited about my son using this product to begin learning to write; however, I'll be shopping for another product because it is evident that this product has yet to be developed correctly.