The sound quality is exceptionally good for freeware.
What I was looking for (and didn't find) is a freeware clavichord that will run on Kontakt 2.
Also, though I like the small SoniMusicae organ a lot, it's a little too delicate and flute-like for one of the pieces I am working on. I am looking for something with a little more bite, but not overpowering. (Again, for Kontakt 2). The organ instruments in GPO and Kontakt 2 just aren't cutting it for me any more.