It's usefulness as a GPS logger is excellent and its battery life is superb.

The battery life is amazing

Battery life has exceeded my expectations and the satellite locks are lightening fast.

Accurate location, fast acquisition and good battery life in a small and convenient package

Battery life is great

The battery life is excellent, although the battery level indicator does not appear to be linear

The files are not lost as long as you have access to an iOS device (I was able to email them to myself).This also happened several weeks earlier, when it hit "80% memory remaining"; it's taking me a while to learn that "80%" means "0%" in Bad-Elf-speak.