I've been using Nike+ for about a year and a half. I have a garmin 800 for my bike and have used polar, timex and garmin watches over the years. I do marathons (and Ironman) and run about 70 miles/week total. This my fifth GPS watch (sixth if you include I had to replace it) and I like this one the most thus far, but with some caveats listed at the end.
Pace accuracy: With my running group we have each of the above watches and compare what the pace is - and universally the instantaneous reading vary wildly and are much less useful than using average pace. I just did the Boston Marathon (2013 - luckily finishing well before the tragedy) and comparing manual 1 mile splits (by tapping the watch at the mile markers) with the gps derived splits for the first 4 miles show how accurate it is: 6:56/6:55, 7:13/7:12, 6:58/7:02, 7:20/7:18
Ease of Use: plug it into the USB port on your computer, Nike+ detects the watch and uploads your run. the Nike+ site does the rest. The Nike+ site used to be horrible but is much improved and useable...but it lacks the "fun" of Strava's web site. The watch screen is easy to read with giant numbers.
Issues: this is my second Nike+ watch. The first one simply died after on year and the warranty was expired. you cannot export Nike+ data to Strava - which truly sucks if you want all your workout (Bike and Run) in the same site.
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