@RenaSchnegge thank you for that. My husband had the Garmin vector 3 when these just came out last yr but had lots of issues with it. He could not wait for the updates… so he got stages ultegra crank duel…
How this question came up today… someone here in Perth is selling Infocrank powermeter 170mm… my size…but my husband said it had bad review in relation to its software… or he is just 
me 
which is most likely 
…