And helpfully they play well with Shimano gears, so you can have the best of both worlds...
They play... ok. And they're noisy.
I've found Shimano cassettes to be better and less noisy and shift better with Sram etap than the Sram cassettes.
Maybe it's a bit of a lottery - I ran a SRAM cassette (force level) with 6800 di2 for ages and it was perfect
My experience too. I went back to Shimano cassettes, except for 11 speed 11-36 which Shimano don't do.
@Acliff started
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And helpfully they play well with Shimano gears, so you can have the best of both worlds...