I´m finally posting here for the first time, so let it be at least somehow useful.
I bought Cinebrass Core + Pro a year ago after using EWQLSO for almost ten years for all my brass needs. (Yes, please don´t punch me hard) After trying it out in a project I fell instantly in love with it and pulled the trigger. To date, I love it. It´s loud, proud and heavy- pretty much as what everyone says.
However, for what it comes to a bit more subtle approach, I have struggled too many projects through trying to make it less epic and bombastic. It´s awesome on the loud stuff (think Poledouris) but every time you want to go more Elfman/ Herrmann- styled arrangements, it´s just so....big, perfect and loud sound. Everything´s superbly in tune, over- the- top and awesome. It´s my #1 brass library for big stuff (like any Cinesamples), but I felt it lacked the subtlety to use it as my only brass library.
So, I bought Strezov´s brass. Which was awesome, because it was....well, kind of bad. :D It´s bombastic, and sports the same characteristics than Cinebrass, but it´s like the drunken little brother of Cinebrass, haha! Sometimes so horribly out of tune it´s funny, way less perfected and sounding like it would had been Cinebrass v 0.2 on vodka, but holy hell when stacking them together you got so sweet imperfection- meets- perfection that I did my next three projects with the combination.
Yet, I still lacked then subtlety, the articulations more than staccato and sustain/ legato and something I could use as an allaround library. So I bit the bullet and got myself the Spitfire Brass a week ago after spending literally a couple of months of listening to demos, checking out reviews and searching Vi- Control topics through like a madman. After fooling around with it for a week, I feel it´s exactly what I needed. Yes, the space is HUGE. (And the dry mics sound like crap compared to the wet sound, which has so much character to bring to the sound) And yes, it´s not as "epic" or "HUGE" as Cinebrass. But boy, does it seem to be versatile! So many articulations, and quite a many instruments as well!
Right now I feel the Spitfire Brass will be at least for now my to- go- library and everytime I want to go more Starship Troopers I switch or stack to Cinebrass. I absolutely loved the bells up- articulations, though, so it´s not that Spitfire can´t go all LotR/ Conan- stuff...it´s just a different kind of sound. More human, if you prefer. Smaller. Yet still epic and heroic. At least that´s my impression for now- but who knows, maybe I´ll switch my opinion in the next months?
But after pondering, I pressed the Spitfire on vote, and hopefully after reading this wall of text you see why I decided to do so at the moment!
EDIT: I was a bit hasty and ignored some of the key questions- sorry about that. But as a quick comment at least Cinebrass fits really easily into pretty much everything mix- wise. I´ve blended it with other libraries (more than the abovementioned Strezov), with extreme metal, with folk music, younameit. It blends really well due to the rather round and fat characteristics (you may want to trim some extra lard off from the 200-300 hZ area if you have a busy mix and maybe boost some 7+k area if it doesn´t cut through) and the very well recorded and mixed source material.