Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Garmin Forerunner 305

The Garmin Forerunner 305 has two MAJOR problems. First, Garmin's algorithm for altitude recording is poor. It apparently records every foot of elevation it thinks you gain or lose. Since there will always be some measurement error in altitude, you could run a mile on a track and the Garmin Forerunner 305 will say you've done 300 feet of elevation when you're done. I've had Polar and Avocet altimeters and both gave accurate readings on known elevation climbs. The Garmin typically doubled the true elevation gain!Garmin's bigger problem is customer service. After using the Forerunner for two weeks, I had a software problem and emailed Garmin's customer service. No response. I emailed again. No response. After five emails over four weeks with no reply from Garmin I gave up and returned the Forerunner.Until Garmin gets some customer service, I'd advise getting a Suunto or another brand.