I use bunch of them. I have few backups such as Nmatrix, Nzb.in, Smackdown, Newztown. Nzbgrabit. my main is Dognzb, I never get password or fakes. maybe like few 3 months ago. I also use Nzbs.org for older files and nzb.su. I not fan of free sites, I don't have time manually search for nzb. my setup is Auto and Nas. cheers :)