> What is that killer feature that Arch offers, apart from being rolling release?
Apart from that its pacman, just sick of the apt-get madness.
And generally having far less default crap on you system.
Before installing Arch, I was a die-hard Kubuntu/KXstudio[2] user. Now I have the ability to build all the KXstudio packages from git (Cadence, Carla, and Claudia make JACK the greatest thing ever), without all the Ubuntu/Debian cruft underneath.
Another benefit (post-snowden) is that Arch is not an incorporated entity in any of the "Five Eyes" countries. Julian Assange has come out to publicly state knowledge of intentional flaws being added to both Open Source/Free Software projects, and specifically namedrops Debian as compromised. The threat vectors one should analyze are which governments would have access to which corporations. RedHat is a registered corporation in Delaware, USA. Canonical is registered in City of London. If one pays attention to Moxie Marlinspike's convergence demo at DEFCON 19, you can see how it'd be trivial for a government agency such as GCHQ/CCSE/NSA to spoof Canonical's or RedHat's SSL certificates. Gentoo and Arch have no corporate influences, and thus are the only relatively safe Linux distributions left, IMO.
So, AUR, Advanced customization, and potentially increased security are bigger reasons, for me, to switch to Arch than pacman.