I don't think you could do this e.g. with Garritan GPO Lite alone. Just a big soft section, too big for a fast Mozart tune, and solo strings, you wouldn't get this sound. These marcato strings rock, I especially like how they play around 0:43, that's very realistic. I also like their sound in the contrabass range very much. What I don't like here is the string quartet and the woodwinds, these both would sound better with either SRX or Garritan.