I've never heard them side-by-side, but while the maggies are nice sounding I think the LS9's are a definite step up. In terms of specs, they're more sensitive, an easier impedance load, and go deeper on the low end. (all the way down to 20hz and can be even lower in room) The LS9's also use BG planar magnetic tweeters, so the top end is just as smooth, but are much more dynamic. They aren't as intimate sounding, but are fine at low volumes. They do need a fairly large space though. I don't have the space or the money, but I've heard a lot of speakers and the LS6/LS9's are among my favorites.