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@gbj_tester
I doubt it, SRAM shifting seems pretty uniform across groups, spending more just gets you lighter stuff. In the case of X9, not really any lighter either. If you have upgraditis, go to X9 for the tidier cable routing and save about 10g including shortening the cable. The X9 parallelogram might be a bit stiffer than the Apex, but not by enough to notice from the other end of 1.5m of cable.