I use it a lot.I also use the FatMaaxer app ( Android Project to find FatMax in real time with a Polar H10 )on Android to monitor it when I’m on the turbo in realtime. I’ve found that the power & heart rate values can vary quite considerably depending on what state I’m in. If this 0.75 thing is an accurate representation of where VT1 falls then I reckon that is a good thing. Bruce Rogers has written about this in his blog. Muscle Oxygen Training: To train hard or not, that's the question. I found that according to this method, when I’m fresh, my heart rate is at VT1 is higher (79% of HRmax) than I would have expected, as is, to a lesser extent, the power.
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