People complaining of the thin sound in the trumpets, in the first example that thin sound is actually more of an orchestration issue with regards to range and perhaps writing straight triads for trumpets. Gets kind of that Mariachi tone. The second example by ED W doesn't suffer from that initially. Trumpets are a little lower and supported underneath by trombones and later horns--leads to a fuller sound.
Personally I've found that in my experience the Bflat trumpets are thin sounding once above their high g. I've run into issues with that. I prefer C trumpets, they sound fuller and a little less "bandy" sounding to me. I think C trumpet if I remember correctly is preferred by most orchestral players, but of that I'm not sure, maybe it was just in New York.
Towards the end the demo by Ed Watkins falls into the trap of the awkward orchestration for trumpets, that lone solo high thing screaming in perfect intonation with out even so much as a little note crack or intonation adjustment, dead give away for samples, but up until then and I hate saying this If I heard it out of context I'd probably be inclined to think it was a real section especially in the opening 11 sec.
Also, for that high exposed stuff I'd lean on Sample Modeling The Trumpet where you can add a little crack and intonation difficulties and wobbling in to the programming.
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.