It's certainly the best chess site I've ever played at.
I think that it's the community that really brings the site to shine - the people here are so friendly and are willing to help others learn and improve as well.
Back on chess.ac, most of the people there couldn't really give a hoot if you fell off a cliff.
Chess.com should be one of the top chess sites it is easy and fast to navigate trough. <*.*>