We are an average team having fun. One issue we have struggled with on all our tandems, but more so on the road is monitoring stoker effort. I appreciate her amount of power, but some times we need less peak output and more constant power delivery.
We have tried a bunch of different HRMs in an effort to put the stokers HR in front of the captain so I could better see how shes doing and make better gear choices or read through her "I'm ok we don't need to stop" as we pass by a 7-11 or cool spot along the ocean.
Jeanne hurt her knee recently and is healing well (no evil comments TG, special tape is done for now). Our friend that is a former Australian National Triathlon champ and one of the girls helping with her PT mandated we start actually monitoring cadence. My non exact was not good enough, but turned out pretty close.
We got a Sigma ROX 9.0, primarily for cadence, as luck would have it, the stoker HR can be detected on the main unit mounted on the captains stem.
With several rides now done with the ROX 9.0, it is proving well worth the money as it lets the effort needed and output keep things well under control.
The downside of the unit, and a screen I may disable is the ambient temp. Headed South along A1A, into a 25 mph headwind, for over thirty miles was showing over 103°f. Pretty discouraging info. I don't need to select it, but was curious.
Also, the altitude function on the ROX 9.0 does work, but is barometric based and obviously varies constantly as the day changes, so don't count on that function as accurate. Percent of grade may also be barometric, so it's accuracy may not be that accurate either. It reads 0 along the ocean.
Just a FWIW topic. So far so good with all (3) of our various Sigma HRMs.