I know this has been popular with Sibelius users and that more than a few Dorico users have been clamoring for it; so having it as an option for Finale sounds like a plus.

I got the notice, too. Don't know anything about it but I am curious.

As you have probably noticed, there is a 30-day trial version.

Has any one used it? That can give a review about note performer if it is necessary ( or gives added value )for finale user?

I've just published a detailed overview on my Scoring Notes blog, with playback demos, remarks from MakeMusic's Mark Adler, and lots of Q&A with NotePerformer's creator, Arne Wallander:

https://www.scoringnotes.com/news/noteperformer-3-for-sibelius-released/

Is note performer a substitute for the Garritan library? Or is it an engine? I'm out of the loop. I need some explaining if anyone can explain it to me. Thank you in advance.

First, note that NotePerformer 3 for Finale is a beta version. So think of it as a first step not integrated with all of Finale's expressions.

Second, note that because NotePerformer "looks ahead" to craft its performance, there is a one-second delay in playback. This means the green playback cursor will be ahead of the performance; but perhaps more important, it means one cannot combine NotePerformer with Garritan or other sounds because they will not be synchronized.

I have tried NotePerformer on copies of a couple of my Finale files and it gives pretty good results, but because I have been using Finale HP with Garritan and other VST's for so long, I would almost certainly not use NotePerformer to produce demo sound files (yet).

On the other hand, I find using NotePerformer with Dorico is a step up from the HALion sounds that come with the program.

@J.A. Verkouteren thanks for the explanation. I think I will stay with my Finale-Garritan in the mean while.