Instruct: Classify the given review into positive or negative sentiment.
Query: Disappointing--doesn't work

I was hopeful that this sharpener would be as effective as the Panasonic KP4A I'd seen reviewed (I believe this X-Acto is made by the same company). The battery sharpener worked sporadically at first, then I thought it was working consistently. A week or two later, I went back to try it again and it hasn't worked since. After I finish this review it's going in the garbage--unless it miraculously works again on a last try. I'm really disappointed in this product.