Yes, I was thinking it was likely that people dropped out after not getting any benefit from it - like your experience, and there are many ways that it might no

Yes, I was thinking it was likely that people dropped out after not getting any benefit from it - like your experience, and there are many ways that it might not deliver a benefit for some people, including manufacturing defects, not being able to calibrate and/or connect it, not being comfortable with the shoe itself etc. They seem to be reading an explanation into the data, which sounds plausible, and is impossible to refute if that's all the data you have. A little data is a dangerous thing. BTW: I assume by "off by a minute", you mean the time component of the pace ratio (time/mile) representation was off by a minute, not that its measurement of time was off by a minute. I'm not down with the joggin jargon, so that was confusing for me.