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@Smallfurry
The many reviews I read, had it over calculating by around 20 watts. I guess it depends on how its calibrated. But if you take your foot off the gas, your hearts going to carrying on. If they calibrate this away. It would'nt read the power peaks well. I guess they went for a middle ground, which means a zone 2 would over read.
But on a short turbo session your heart rate will lag behind your effort. You then turn off the reading when you stop pedalling. That could be it. Like I said it disapointed me for the 45 min session though.
My heart rate builds mad slowly. I've nearly quit a few half marathons at the 2-3km mark. Because my body just isnt ticking. It then drops to normal in practically no time, when I stop the effort. I've been training using HR for years. Even without a belt on I can judge whether my effort is maintainable, by gauging my HR. Thats running though.
I love using HR for running analysis. In my veiw the the powercal is just HR translated to cycling speak. Not a power measurement in itself. Which is fine by me.