I have no personal experience with this new Polar watch. I am dubious however that the predictions will be accurate. If you have not read this article you should. My guess is that Heart Rate variability is still the underlying measurement that they are using to determine recovery state. As for the wrist sensor: I’m dubious that it will be accurate enough. We’ve tested the most expensive watches from all the companies and NONE of them work well for wrist based HR. Maybe Polar has come up with a break through here but I doubt it. I would love it if this watch did the things they say. Maybe I’ll have to get one and try it. Until them I remain skeptical.