I've not read specific resort reports on the Wi-Fi but from what I've gathered it's pretty decent. The download speed was a bit slower that what you'd get at home, but that's to be expected with so many people taking advantage of it. I saw one review for CS wi-fi when I googled. It was from back in August and someone said it dropped a lot and it was slow?
Maybe they've gotten that fixed though....if I'm not mistaken that was one of the first months it was rolled out?