It is reliable and the heart rate monitor works very well for me. The interface and functionality are great, and I found it to find GPS satellites relatively quickly. However, the charging clip/USB connection is almost fatal. Connect safely and completely difficult. You need to keep a close eye on the watch face to know you have a good connection, and you need to be careful not to miss that connection when setting up. I kept finding the watch dead when it should be fully charged. With a better connection this would definitely be a 5 star article. Another problem is that it turns on for an unknown reason. It doesn't happen often enough to really bother me, but it's annoying. UPDATE: Unreliable and GPS found unreliable. Over time, the GPS function of this watch proved to be unreliable. On a hike today he refused to snap after 30 minutes. Also, after a while it will just stop trying and you'll have to try again to find a GPS signal (although this has proved useless). It's a shame it could have been a good product but it's too frustrating to own. I would not recommend anyone to buy this.
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