I use WoWMatrix and have no issues. But, I also have the authenticator along with a custom host file, and (more than I prolly need) other security softwares on my computer to headoff keyloggers and the like. Plus I am extremely picky about the sites that I visit, plus I am the only one who uses my computer in my house.
You can find WoWMatrix for download on the official Apple web site and CNets Download site. I find it to be pretty safe as the program itself will not allow any executables to install. It runs a bit slower than WAU, but I think that's because each addon is scanned by them before it's downloaded onto your computer. I find it easier to use than WAU, and it definitely looks a hell of a lot better imho.
You can read about it here:
http://www.wowmatrix.com/safe-computing.html