The sounds themselves are great. One thing that always gives them away (for me) is hearing a slight 'attack' on each not (even when playing legato). Skilled and careful playing can mitigate some of this but it always seems to be there. I guess you could go in an edit the tone to take some of the attack off but that would also affect the authenticity. Oh well, maybe I'm being too picky. Diki used to always nail me about my feeble attempts at emulating sax. He was right, of course and it did make me try to do a better job with the emulation.
BTW, you also have to pick the right sax for the tune. A 'growl' sax is not going to work on a romantic ballad

.
chas