Maybe it's a bit of a lottery - I ran a SRAM cassette (force level) with 6800 di2 for ages and it was perfect
Force level is quieter, the cool milled from single block of steel construction of the red cassettes makes them particularly noisy, but durable and very light.
They shift fine, just not di2 or mechanical Duraace fine.
@Acliff started
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Maybe it's a bit of a lottery - I ran a SRAM cassette (force level) with 6800 di2 for ages and it was perfect