Perfect World is a Free to Play MMO. Of course there are upgrades in the form of costumes, mounts and so forth that cost real money, but you can play the game for free. It looks like PW has been out for a while, so it’s mature and in my several hours of gameplay, I did not encounter crashes or obvious bugs.
But I wouldn’t say it was Perfect by any means. Compared with Guild Wars and 2Moons [Dekaron], it has some minor drawbacks. I’m not going to do a full review here, you can find more complete reviews on the web. I’ll just do an overview of some of the features that I found most notable.