6.8 and Procmail/Formail: anyone still using them?

Wonder if anyone is still using Procmail/Formail under 6.8 for presorting
incoming mail before it hits one's main inbox.

Also wondering if folks send the remainimg mail, after filtering, to
/var/mail/*user*, or to ~/mbox or to ~mail/mbox. Any advantage to be had,
or any mere consensus, regardless of advantages?

I also use whitelisting extensively, and any such "From: emailaddresses"
get priority. Does anyone else?

Myself: Having problems with Procmail/formail, after upgrading from 5.3 to
a new server running 6.8. Would like to hear of anyone else's experience.

Thanks,

Austin Hook
Milk River, Alberta