Now that I've purchased your complete set of RealDrums Packs, and had some time to check a few of them out, I can say with confidence to anyone who's interested that they are really good. Thanks Cerio.
The Disco pack really fills out the genre nicely. PGM's disco drums, while good, were a little too camp for most of the disco songs I like. Yours are more subtle and cover a wider variety of works in the genre.
The Nirvana set is really close to what you'd expect for popular Grunge from the era. Another great addition.
BTW, I've taken the liberty of adding a link to your website from the BiaB wiki. You can see it
here.Please feel free to add anything else you'd like.