Marcel Lohmann, one of the admins behind the NiX Spam DNSBL, reached out to me to ask me if I would review this DNSBL. I haven't published any new blacklist reviews in a couple of years (and that's not likely to change any time soon), but I am happy to link to his Spamhunter blog post that talks about why you should consider using the NiX Spam DNSBL.
What say you, good readers? Do any of you use this DNSBL? What do you think of it?