Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Solid GPS watch

I'm using this for the past one and half year.No problems so far.I replaced the battery of the heart rate monitor last month.I would recommend this product to anyone looking for a good gps watch.BTW ,I bought it for $110 and now it is listed for $250.It is the only gadget I saw where the price is going up.