General rate: Negative
The Party Poker installs the Poker Client on your PC. It also installs a Keyboard Logger, a Mouse Tracker, a hook to Messenger and Screen Capture. These are all supposedly to help Party Poker ensure you're playing fairly. They basically can follow EVERYTHING you do on your PC. There are plenty of sites out there who don't do this and who aren't so disrespectful of their customer base. Play on one of those sites instead, not with Party.

General rate: Negative
It's not working in Windows Vista. You can start it right after the install but if you shut it down you can't start it again.