I've messed around quite a bit with the SA sax voices in the MoXS... to be honest, I'm not that convinced. Making them monophonic kind of limits your options (sometimes you WANT to go divisi), and, try as I might, I couldn't get even close to the famous SA sax demo. That thing was sequenced and massaged to hell and back, not live play in the slightest, and I've heard little from any live demo that elevated it far beyond what I can do with normal triggering technology.
It certainly helps those that have no decent sax chops at all (Yamaha's target market, for sure!), but it wasn't the eye-opener I had hoped it would be.
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An arranger is just a tool. What matters is what you build with it..!