For those who are surprised the Edge 200 doesn't read cadence/HR/power, look at history: in the early days of Edge, the 205 was the sensorless sister to the 305, and later it was the same thing with the E605/E705. I'm surprised it took as long as it did for them to release the 200.

As far as the captain's posterior interfering with reception, not a problem. I have an Edge 705 on my bars, and she has an Edge 800 on the top tube, so it's under my butt etc. She has occasional HR dropouts which I can't seem to resolve (scary when the tandem-com tells me "I'm dead!"), but all other data seems fine.

For relative outputs, we just blinged out our rocket with twin powermeters. I'm showing 145W average and peaks to 850W, while she's showing 95W/390W so far. However, both of us are experiencing newfound improvements thanks to a summer of good riding and better positioning, so who knows what's ahead.