Just did a careful listen of the video demo with headphones. I own all the current AudioModeling strings, so I'm pretty familiar with what they've done so far. I don't think I can make any judgements from the sound of this video. The reverb might be in the ballpark for the environment we're seeing, but it's a really dense and short reverb on the demo. If I were going to do a demo of the current AudioModeling strings, that's EXACTLY the kind of reverb I'd put on them, in sufficient quantity, to mask what I find lacking in modeled instruments. They just don't have the complexity, spaciousness and depth of the real thing. Lots of reverb will hide that.
But what I DO really love about AudioModeling and SampleModeling instruments is how easy they are to play expressively, and in a connected manner. You can really PLAY them without tons of key switching, and they feel so much more immediate under your fingers. A LOT less work to cobble a part together. I'm interested to hear what these new instruments sound like before the verb is piled on. I really do think that modeled instruments are the future. We just need some really fancy models.