Yeah, I tried it when I was setting up the computer, and headed to the 7-Zip page to grab its installer. I saw it advertised, and thought: "why not?". I played with it like 15 minutes before it was uninstalled, it's slick and everything, but it lacks most of the compression options 7-Zip has.
WinRAR FTW anyway
EDIT: D'oh! The grammar