[mestudent]

I haven't had any trouble with AUR any time I've used it, most of the time a simple makepkg -s does the trick, but maybe it is just similar enough to slackbuilds for me not to mind.

To be honest though Arch moves too fast for me and there are quite a few advantages for not, I use ubuntu though because it is easy.

[IvarTJ]

I generally come across errors if I attempt to install a port with yaourt that has many dependencies that are neither in the main repositories, such as the Yi text editor written in Haskell. Though I recognize that it is probably better than installing things without informing the package manager.