fit.fix wrote a review of Polar S625X Watch on December 1, 2004
The best heart rate monitor I have owned. I have owned polar Accurex Plus, S520, and S710, Suunto x6 HR, and cardiosport monitors and this is the best. The running distance speed was accurate to 50m over 5.9km before it had been calibrated! The only negative is that it doesn't have auto start/stop when cycling (like the 700 series does).