Almost forgot to talk about the drawbacks. For some reason, apt-get dist-upgrade will break everything, starting with the themes and ending with the python installation. Apart from that it is extremely stable. When looking for an edgy OS to use for my server, I started with Kali (which crashed almost twice a day for various reasons) and chose WeakerThan because after more than six months of constant use, it hasn't crashed yet.
So, long story short, check WeakNet Labs out!
WT7 Beta has a distro updater that works for me. It is still in Beta though, so watch out for bugs