Always wanted to tell the story of why I use Arch. Once you go Arch, you never go back. That has been my experience so far and I am a loyal openSUSE/Kubuntu user. Once in a while I will try Linux Mint, Ubuntu and other distros but I always come back to Arch within a week or so.
It will hook you because it gives you an unbloated, fully customized system. You'll love how easy it is to install apps. (How hard is it to 'yaourt amarok' and then type 'y' for yes?) And availability of the latest packages immediately is the killer feature - no competition there. And the icing on the cake is the rolling release.
THIS is exactly what a Linux user wants.
All that said, Arch Linux is not for everyone. It does take effort and a user's desire to learn and try things out to make it work. You need to know stuff, or know friends who know stuff. If you are not willing to learn and try you will end up with leaky pipes, exposed live wires and, at worst, a house on fire.
Arch is for those who are willing to invest time in Linux. Because everything has to be configured manually, there is no spoon feeding. You will learn, in the process of using Arch, how the basics of a Linux system work. And once you learn that, everything else becomes easier.