Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great Device Poor Performance

I first heard about this product from another instructor at the school that I work at. After trying it once, I immediately went out and bought it.I used it for one semester and experienced some of the same problems that others have; draining the battery in the carrying case and difficulty with the laser pointer. Now, after only one semester (16 weeks) the back button on the front and side is not working at all.I sent an e-mail to Keyspan, but have yet to hear a response. If this is the type of service and performance we can expect from them, then who is their competitor? My initial thought was to buy another one, but I don't want to give money to a company that isn't going to back up their product.I love the product and the idea, it was great when it worked, but I don't think that I will be buying any future Keyspan products because of the lack of customer support and the short life span of a workable product.