Strengths: works perfect in woods and keeps a signal well during the majority of my runs was eve very accurate on the tunnel 10k where we went through a 1 mile tunnel. a nice small compact unit.
Weaknesses: lost signal during berlin marathon and acted very strangly (hopefully that is a one off), agree with the rest about the calourie counter. auto-pause feature is iffy so disabled it.
Overall: great unit that is an improvement on previous ones, however can somtimes be to clever for its own good and gets into dificulties.