Anyone try 'selective greylisting' with qgreylistrbl?

qgreylistrbl 0.5 looks like a replacement for rblsmtpd--no need to patch
qmail.

Unlike others, it only greylists ip that are found in specified RBLs or
uses suspicious HELO. It doesn't blindly greylist every ip.

If you've used it or are evaluating it, please share your experiences.

Also, what SMTP benchmarking utility would you recommend for people
interested in tweaking qgreylistrbl? I don't know perl but I'm guessing
this is an ideal candidate for precompiling or PPerl or mod_apache2 or
mod_fastcgi+compiled_httpclient.

http://www.datenklause.de/en/software/qgreylistrbl.html

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netqmail 1.05
chk-user 2.08b (CHKUSER_WRONGRCPTLIMIT=1 simply rocks)
vpopmail 5.4.13
rblsmtpd (sbl-xbl.spamhaus.net, list.dsbl.org)
qgreylistrbl 0.5 (evaluating with more aggressive RBLs)