Tabbykatze
It does look very pretty and do agree in the hope the battery life is decent. At least 2 days hopefully.
I was thinking 40 miles duration when running, comfortably within the 26 miles needed for a marathon.
Have you seen how cross a runner gets if their Garmin dies half a mile from the finish line? Several hours of GPS data logging is quite battery intensive though, so I don't know if the technology is up to being in a device this small yet. Just a matter of time if it isn't though, such is the way of technology.
OTOH, people like my wife who do half marathons are probably a much bigger audience.