Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Beware of "hidden costs"

I don't have any big problem with its technical specs. My Pro Tour XL works, but its design is flawed. Because its power button is bumped and very sensitive, the device can get powered on very easily in the maker-supplied carrying case. You notice every time you simply put it back in the carrying case, the device turns on. I'm sure that it gets on whenver I grab it or it's packed with other stuff in a golf bag. As a result, battery drain is significant. One battery lasted only two months for just a few rounds of play. At this rate, costs of batteries can quickly surpass the price of this device!