Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Hunk of junk

I have a cheap Casio watch that can tell me how much time I have run or walked. But I purchased this expensive product (the Forerunner) because, among other things, I wanted to know how far I was going for each unit of time. Although it worked well at first, after six months the distance has become increasingly more inaccurate. For instance, several times today, I walked two blocks, and the distance had increased by only .01 mile. I have even noticed the distance going backward (which it did three times today). As a result, the distances are completely unreliable. I would have thought that the device could at the very least keep time and distance accurately. And six months is much too short a period for the product to quit working properly. I am very disappointed.