Summary: I was super enthusiastic when I bought this GPS watch, but a few things have tempered my enthusiasm: 1. I ran a 16km race the other day that was completely officially measured and certified to be 16km, but the watch read 16.45km. That's a pretty darn significant discrepancy.
Summary: The GPS doesnt perform propely. I have been out for running 5 times and in 2 of them the GPS signal is lost. I dont what the problem is, but my last watch, Garmin Forerunner 405, lost GPS signal very seldom.
Summary: I disconfirm the water resistance properties: after one year of normal use (not more than 6 meters submersion in the sea) this watch leaked, the screen sweated; in addition to that there have been 2 serious hangups that I was unable to handle.
Summary: I have been using GPS devices for years, mostly for running, trail running, hiking in the Sierra Nevada, and biking. I chose the Garmin Fenix in March of 2013 because it offered a long battery life, and I was training for my first ultramarathon.
Summary: I had this watch for the better part of a year, seeing it go from software v2.60 to v4.00. This was an ambitious project, stuffing a full-fledged GPS into a watch, and so I patiently waited for Garmin to iron out the bugs and make it more stable.
Pros: Comfortable, Compact Design, Easy to read, Modifiable Menus
Cons: Slow to acquire satellite, Slow To Respond, Unreliable
Summary: First watch I purchased from Amazon, about a week after wearing it condensation formed inside glass of watch. I've read this is a problem in the manufacturing. I returned it and received another watch.
Summary: While all the features are there and the watch works beautifully when it works, it lasted for two hikes and one surf session before coming up with enough condensation inside of the face to make the data virtually unreadable.