H.B.
I also have a polar. I have the F6 and this is my 3rd Polar. I had a real basic one before & then went to a real complex one and finally they came out with a pink one and I could not resisit!!!! My friend and workout buddy recently bought a timex heart rate mont and took it back after a week. She said it was too hard to figure out. (she replaced it with a Polar)
as for the other response, I have never picked up anyone elses heart rate on any of my Polars. Good luck
H.