eh, it's just i'm a sax player also and i'm real critical about the tone of synthesized horns. it's fine if i'm composing something through Finale and all I got are the GM sounds, but I'd definitely not put it on a CD to give to other people to here.
instruments that are struck like the piano or guitar or drums can be faked a little easier than wind instruments, in my opinion. There's a lot of subtle nuances in a musicians embrochure, the way they control their breath, intonation, tonguing techniques, slurring, etc. Perhaps one day we'll get some good samples of a sax out there...until then, we'll keep paying real musicians to do it for us