I'm impressed on this very good article.
Internal sounds are good also for me. I’m using same sax as you.
Also nice is internal piano with strings.
Sinth sounds are the best in original internal. But I use also from VSTs.
Basses are deep and good. s. In this moment I use guitars from NI KONTAKT. Also internal guitars are good. I made some modefications on this guitars.

Zmago