Just had our first show using SAC to run 20 channels into 4 stereo IEM mixes, and 1 wedge. No issues with SAC, though it was mostly 'set and forget'. I'm using 4 ADA8Ks and am passing those 20 channels to the FOH snake as well. That was the only 'whoa' moment, when our FOH guy was slammed with quite a bit more gain that he was used to! Ooops
It just took a minute for him to dial back the gains on the SL24.4.2 and he was good to go.