Only the shifters mechs etc that SRAM run on the 1:1 ratio are not compatible I thought. SRAM also do 2:1 ratio shifters the same as shimano.
Found this explanation on another forum:
SRAMs X series is all dedicated to their 1:1 pull ratio. From X.0 all the way down to X.3 and also anything with ESP as part of the model name. SRAM drlrs and shifters ONLY.
SRAM products that are Shimano compatible are any 2:1 ratio models that include MRX as part of the model name, Centera, and Attack in GripShift. The TRX trigger-shift models also work with Shimano drlrs.
So SRAM is not a total failure as long as you check the actuation ratio is the same, 2:1