pkgng + poudriere = my sysadmin sweet spot. I can customize package builds to my heart's content while continuing to use the FreeBSD package repositories (if I want). It'd be nice if pkgng would build stuff from the ports tree if necessary, like MacPorts does, but frankly pkgng is good enough as is. If I need more than FreeBSD's binary package set, I'm comfortable with building directly from ports (in case of one-offs) or expanding my Poudriere deployment. Compared to pkg_install/portupgrade/portmaster, pkgng is awesome---flawless binary upgrades, even from my custom package repository. Compared to YUM/APT, pkgng is still awesome---setting up a custom repository and automating package builds is pretty easy, especially compared to Spacewalk (which I want to like, I really do).