The RUKinder who bought my backup AxeFX Ultra was asking some pretty good questions about the importance of full range full response (FRFR) monitors, which are vital to getting "that sound" when you're using this sort of gear, because if your monitors aren't flat, you'll never get it dialed in correctly; that's why I like the QSC K12 and K10, they are pretty flat, as compared to something like the QSC HRP122i, which is designed as a vocal monitor, and has a pronounced midrange. Then you're fighting the monitor sound and losing the battle overall.
I compared a brief excerpt from the board recording from a show we did in the fall with an audience recording, and found that the guitar sounds pretty much the same on the board as it does in the house ... the whole band does, largely, which is good to hear. The club that night has a non-descript JBL PA, and these were stereo mics on an 8-foot stand by the soundboard.
If you think about it, Healy used to spend a lot of time EQ'ing and noising the rooms to get the PA as flat as possible, then he'd mike Garcia's cab and not use an EQ on it, so the whole PA became just an extension of Jerry's speakers. It's the same concept with this impulse response technology, and it works quite well,