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Work at a velodrome, we have 79 bikes with Primatos so quite experienced with them, the others not so much.
Personally though, the spider/arm interface on the Rotors looks like a weak point. I have experience of other cranks that use similar systems (like middleburn) and wouldn't recommend them for fixed use outside of a velodrome.
Infact I ruled them out straight away, I'm sure that Sugino, Rotor or others might have failed in the past for people and still fail too, but I read way more complains for Miche than for the latters.
@M_V when you say we I assume you work in a shop right? What's your take on Sugino vs Rotor assuming you might have direct experience?