I love running alone but would sometimes find it difficult to get motivated to do a run. This watch changed all of that. I use it's marathon training plan which gives you a calendar of events to stick to. This doesn't just include running but cross training, swimming, pilates, yoga etc.
I find myself at the mercy of the watch, if there's a run today on the calendar, I have to do it, I can't let the watch down. This may sound weird but it's me the world of good.
The GPS function is brilliant even to the point that you can see which side of the road you were running on.
Another perk are the medals (and a celebratory jingle) you get at the end of a run if you've achieved a personal best time or distance.
The first time you try to get a satellite signal can take about 5 minutes but all other connections since (in my case) have been within a minute or two.
The interface is great and the online interface is great too.
Although pricier than some other models I have to say I'm getting more out of the watch than I was expecting so I'd recommend it to anyone.