Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Superb concept; poor reliability

I've owned this watch for a year now. The alarm is super easy to set -- just rotate the outer bezel and pull the knob. I use it all the time -- for timing the coffee pot or reminding myself to make a phone call in a few minutes. The vibration alerts me when I can't hear the high pitched alarm from some other watches. But after just 8 months, the knob that sets the alarm pulled out completely. I sent it in for repair and the watch was returned in a couple of weeks. Now, just a week ago -- just after the watch went off warranty -- it happened again. I love the ease of use, but I can't recommend the durability of this watch.