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@tis
The Stages left x2 power measurement got me thinking about how accurate it would be for me - I've got some nerve issues with my left leg. My PM has been recording the left/right balance for a while but I've never actually analysed the data so I trawled through it all to see.
It was a bit of an eye opener, if I had started out with a Stages unit I'd have burned all my bikes by now! Turns out that generally my balance is 43/57 but the longer the ride the worse the balance, after 3+ hours it can get worse than 40/60. I'm aware that I have an issue so it's not all that surprising for the longer rides but 2*20 intervals when I don't perceive any problems, it's still generally about 46/54.
My maths are probably wrong but for me that's the difference between devices calculating my FTP at 295w and 270w in the best case scenarios. Thought this might be useful info for those in the market for a PM.