I owned the Integra for several years. The main thing lacking with the SN-A solo sounds is a realistic vibrato. If a vibrato is not sampled, but created by modeling parameters, it just never sounds realistic. I especially disliked the vibrato of solo strings.
Some of the underlying „samples“ the SN-A sounds are derived from are also not too convincing. Saxophones are really poor.
Take the trumpets. The physical modeling provides some very nice effects such as glissandi and legato. But on the other hand, the vibrato sucks. All in all, I often preferred a Yamaha Motif or Ketron trumpet with a nice vibrato over the SN-A trumpet that never sounded inspiring when playing long notes.