Username or EmailPassword
I'd recommend it. You'll miss pacman, but compiling slackbuilds is very similar to rolling your own packages from the AUR, so it shouldn't be that hard. You'll have to resolve dependencies yourself, but that makes for some recovered sanity in my book.
Enjoy the stability and Zen.
I have been using "sbopkg" http://www.sbopkg.org/ to install slackbuilds from slackbuilds.org. It's a menu driven program similar to pkgtool that lets you search, install, and uninstall easily. Works great