Sorry folks, but I think this lib is a complete bust. It sounds simply awful, and the demos are dancing around it. I kept searching through the patches, wondering what I was missing. The answer? Pretty much everything you care about with brass. All of the legatos and longs are simply inarticulate at onset. They have no initial voice, either bad editing or recording. Never mind the terrible mostly nonexistent legato transitions. And it's not just one instrument, it's all of them. The sustains sound like cheesy too-short loops. Seriously, you'd be better off with ROMpler brass than this lib. The room sounds lame too, it's just something to work around. Then you've got levels jumping around from note to note, and, within a note, jarring jumps through the dynamic range etc. The low dynamics are uniformly muddy.
This is by far the most disappointing lib I've ever gotten from Spitfire.
To get a sense of what it's missing, check out SStB vs (how old now?) VSL vs Berlin. Whatever variance on legatos, VSL and Berlin both seem like the same instrument and capture a sense of instrument/player/place/voice. SStB sounds like a brass harmonium or something. (And yes, I was playing SStB with the same legato as the others, to no avail). I looped around twice because situating SStB between the others makes the problems so evident.
And as I said, it's not just the horns. All of the instruments suffer similarly.
SStB kills the studio series for me (I didn't love the strings, but mostly on content and room, not quality, grounds). If you want to play minimalist shorts like a robot army, have at. If you want something that sounds like brass and can play brass parts, look elsewhere - IMO, YMMV.