Strengths: 1.Easy to use - buttons large enough to operate with gloves and/or frozen fingers. 2.Display is great - nice and clear and simple to read, even when you're completely k*******d. 3.Interval training feature is great for sticking to the routines in the RW Marathon schedules (even though they still hurt!) 4.Once you start to use one, you realise how often you kid yourself as to how far you have run, if you just use your watch. My training this winter for the FLM has been much more robust than any other schedule I've done, simply because I always know I've done the distance.
Weaknesses: 1.There aren't many but - it is a bit slow to pick up satellites when you first turn it on, but I have learned to use that to my advantage - it makes me do my stretching exercises properly and not just charge off like I used to do. 2.When the battery gets low, it tails off very fast, with little warning. However, for most people, even being keen, a charge once a week is fine.
Overall: Great piece of kit, helped my greatly in my training and has revitalised my view of my potential - achieved two PBs in the last month, down to the help I have had from my Forerunner.