Thats one good reason, I would never have paid for a new cassette , or durailureI would have have stayed with ex1, but the cassette alone costs more than the xtr/xt 11 speed setup.
Iam hearing a number of stories of 12 speed chains breaking easily on sram
Yes it could well be , especially as 12 speed is pretty much only sram currently .It could be the brand chain too. I've found KMC chains to be much stronger than SRAM. The pins are shot peened better so the links don't burst off as frequently as SRAM chains do. At least ive found this to be the case with my regular bikes.
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