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@Dammit
Pre-omnical you have to either send it back to Quarq or re-calibrate it yourself with Qalvin/dongle/iPhone if you change the rings.
Or, sometimes, after you have tightened the chainring bolts up.
=Omnical strikes me as a desirable feature.
Very worthwhile asking the seller about the zero offset- what is it at the start of a ride and (this is very important) what is it at the end?