After endless frustration with 3 non-functioning WearLink chest straps, I was back to the tried and true plastic strap firmly. With the exception of a few seconds, at which the belt has even lost the pulse, it works absolutely flawlessly. I guess so rough: running 500 minutes, 1 minute of downtime while compared all my old WearLink strap at 1 hour walk about 15-30 minutes no or vastly inflated pulse (220+) have received. Strong buy recommendation!
