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@Dammit
As far as I understand it this is all about lactate threshold, which defines the zones - a lot of posts from new users have said that they think it rather underestimates threshold power, and I guess that that would have a knock-on effect on threshold HR.
I invested in the Kickstarter for this last year, never got round to using it until today.
I'm going to use it's figure for my FTP, see if I can get that figure up a little over the next four weeks before testing again (which will be just after I get back from ten days at altitude in Colorado).