Review of Yaourt powered by the Slant community.
Yaourt (Yet AnOther User Repository Tool) is a community-contributed wrapper for pacman.
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Pros
Pro Equivalent to pacman
Yaourt commands and flags match pacman, so it is immediately obvious how to use it.

Pro Colored output
Pro Adds seamless access to the AUR
Pro Can be set up upgrade your system with no additional prompts
Pro You can adapt PKGBUILD to your needs during the (pre-)installation process
Pro Supports backups
Cons
Con Insecure
More information here.
Con Not maintained anymore
According to the Wiki page of Archlinux, Yaourt development is stalled.
Con Does not perform clean builds
Environment variables may get carried over while building a package, preventing successful building.
Con Bad split packages support
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