My apologies! I don't mean to do a disservice to anyone. I should have probably just liked Jason's post and left it there.
My aversion to guts coms from watching students and other local players go through gut phases and thinking they always sound better after these phases pass. As far as the intonation issue, I'm not sure what causes it, but I suspect two factors are to blame. First, the pitch of the strings slip a lot, and that affects intonation. Perhaps in the case of my students having these phases, their bass has to acclimate to my office, and an hour isn't enough time for that? Second, and I could be wrong about this, but it seems to me that the pitch aspect of guts speaks more slowly - at least for pizz - than steels do. I suspect it has something to do with string construction and mid/high frequencies inherent in the typical jazz steel strings that makes those overtones pop out quicker, which in turn helps the player adjust more quickly and stay more sure footed than when they can't hear those frequencies quickly. But again, just my observations.