when my HRM-Run stopped working I bought a dual. now the dual is working intermittently and last 2 times out broke link quarter mile from finish. I've had no end of frustrations with 2 straps and in desperation am considering buying yet a third one. but I expect a new one won't work any better than the first 2. do we just have to conclude that the Garmin HR straps are not worth buying. I'd love to know what the total success across all users with the things is. how about, "Is one model more reliable than another?" so most users' straps crap out on them. obviously people are having a lot of problems based on posts in this forum. ..... comments? how about some Garmin techs weighing in.