Hi RolandLover,
I still own a Pro and inspite it's age it still makes some fine music.
The main reason why people buy an arranger over a snth is the arranger function (styles) obviously.
With 3rd party styles and software it stlill holds it's own and rocks the house....
At the last California Synth Zone jam my Pro was right next to the Tyros1 and had no problems whatsoever keeping up with it.
It of course depends on what you are looking for.
Maybe you want to ask some specific questions that we then can answer.
BTW I have used the Vocal Harmonizer a lot and done my own custom settings and it never gave me any problems.
However Esh is right: "Yamaha went a bit too far with the features they crammed into it and consequently it's quite possible to overload the keyboard's processor by asking too much of it at one time".
But this did not happen to often to me. And I learned to get around it.
Eric