The writing / orchestration plays a huge role on how the samples behave / sound. But for the moment these are the only 2 demos available to base an opinion on the library and the sound of it - usually the initial demos of a product are the best demos (could have sounded better imo.)
I still think that the overall sound is 'thin' (coming from a classically trained trumpet player and still playing for the past 25 years.) What I am missing is 'bite' in the sound. It's somohew too perfect, and sounds 'synthy' at times (especially in the second demo.) Maybe more 'massaging' was needed in the production of the demo, the releases of the samples or other tweaks to make it sound closer to what it should sound. But, this is what we have at the moment to listen too.
I like the sound, however, in the limited Andrew's walkthrough and I hope that more will come showing more of the 'naked' sound. I'm also starting to think that maybe it's a taste in what the orchestral sound should be from the Audiobro team and the applied recording techniques, hall used, gear used, etc. (LASS comes to mind - it sounds 'thin' as well.)
As for a sound reference in all being discussed here is an example:
Audiobro is one of my favorite developers and I have all they've made so far. I'll probably end up buying MSB anyways just for the great GUI, articulations, list of instr. and the rest of the great features.