Ease of use: 4/5
A few niggly things such as the watch going back to "demo" mode whenever it's charged, so you have to reset it every time.
Efficacy: 5/5
It does what it's meant to do. It records runs perfectly, with accurate GPS mapping. The built-in heart rate monitor is accurate.
Calorie burn: 5/5
Deadly accurate, and not just on a run. Because it tracks heart rate so accurately, it means that the calorie burn readings are pretty good.
Improvements: 4/5
It's a bit fragile.
