Works very well
I use it when walking, and its measurements of route and distance are correct and consistent (so, doing the same walk twice gives the same readings). Battery life seems reasonable (I have logging set at 30 seconds) - I use about a half-charge for an hours exercise. Maybe those having accuracy issues are using their phone in a place that has good GPS coverage? Where Im using it there is always a clear view of a large part of the sky, and Im simply not having the issues that some others report.
Golden Teapot about
iTrail