I was the Chris Hein thread I saw you on. The video is amazing.
I am so happy with SM brass, and how playable it is from the WX5. I haven't delved into manually post manipulating the other functions to see what that adds, but the fact I can get a realistic sound without having too, and knowing there is more has totally sold me.
I hear some of the criticisms that sometimes the strings sound a little synthy, or saxy. But I think that's a performance issue, with the midi, and can be avoided in the playing or with little fixes for the slips. So I'd expect to have to adjust my playing and how I attack a note differently.
The other thing that appeals is their bass clarinet. My tastes come more from Modern Jazz where its pops up a lot, and I love that sound, it's like dark chocolate. I like ensemble work like Gil Evans, Jaga jazziest, and the SM seems well suited to this sound.