To all who are considering World of Warcraft. Beware. The game is enjoyable enough. But the problem lies with Blizzard Entertainment. Five million users. An income of at least 50 million per month. Yet they will do nothing to improve the infrastructure. The game lags most of the time. I use a 3Ghz PC with a cable connection. Yet very often following a major patch, the game is almost unplayable. For every feature that is added, there are 2 problems created. The developers would rather release and unstable patch rather than fully test it before taking it live. If it's working it's fun. But over the last 5 months, it's been a battle against the lag.
Wait before you buy. Make sure the game is running before you decide to play.