Regarding Z3ta; +2 vs. 1.5: Yes, they are both programmed loud. However the +2 patches clip much more than 1.5.
It seems to me these sounds were designed for a specific market. I've downloaded some free patches from CHE which seem to fall under the same style of loud and cutting. (and often clipping too).
I can't say enough of the Xenos libraries though that are wide ranged, balanced patches for the those that don't belong in that other market.
I don't understand why Cakewalk insists on charging twice as much as the developer does for the same product though. This is one of those cases where I have to continue to warn you to not buy it through Cakewalk and go to Xenos directly. It will save you about $16.00 when you buy all four sets. And they really give a better show of what else Z3ta+2 can do.