I just installed my XX1 grupo last night.
I haven't ridden it yet, but on the bike stand, whenver i turn the cranks with the chain on the 3 smallest cogs, i feel some sort of vibration from the drivetrain, i don't know if this is normal or would go away once i ride it, but i'm also afraid i might have done something wrong like maybe the cassette lock wasn't screwed in enough? I did lock it in as far as it can go.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: XX1 Cassette Vibration