I bought this watch for training and leading up to me first 50 mile Ultramarathon. The pace features are fantastic, as well as the altimeter and temp gauges. I actually owned a Suunto Core previously. (returned due to condensation in the face) The advertised run time with full GPS features is around 30 hours. I thought this would be more than enough charge time to get me through a 50M. I was wrong. Like, 40 seconds wrong!
The watch was awesome! Kept me on pace, kept me motivated. Kept track of my calories burned, elevation changes, miles ran. But I started to get a little concerned when I reached mile 48 and the watch started to flash the battery on the bottom. I knew from experience with other watches, that this meant the watch was a few hours from expiring. I was wrong again. With less than a mile to go, the watch pooped out. When I got onto Movescount.com, I loaded my track, 49.2 miles. I was so disappointed. My frist ultra, and I was cut short by only a few minutes and less then 8 tenths of a mile.
On president, I sent it back. I finished the race in 11 hours and 53 minutes. WAY under the 30-50 hour GPS functionality advertised.
On the other hand, this thing is sweet! It looks fantastic, works like a dream, and the pacing feature is unrivaled. But keep your rambles to under 12 hours if you want to track your whole series.