I have never tried a real CS-80, but I refuse to believe that it sounds as thin as this. I don't quite understand that this developer is still requesting donations for use of this instrument, which only relation to the real machine being the name. Talk about false advertising.
Actually, the Arturia Yamaha CS-80 emulation also sounds rather thin, and pretty much like this. I have yet to get a great sound out of it the Arturia emulation.
And to be fair, the developer has added "stronger blat" to version 1.3--according to the Website, at least. (I can't confirm this myself, as I'm not sure how strong the "blat" was in the previous version).