I recently switched from a POS windows PC and was worried about the WiFi performance speeds of the iMac, since most of my experience, there has been quite a dropped going from LAN to wireless. Now whether this is because I had old pc laptops or whatnot not sure. Until I switch some things around, my cable modem is serving my old PC and my xbox which I use as a media center, so have the iMac sitting off in the den on Wifi. I think there was an article about this this week, but the WiFi on my iMac is amazingly fast. So kudos to Apple for upgrading the capabilities. I don't use the Airport Extreme, using a WNR3500l, and did a speedtest.net and had speeds around 25-35Mbps on WiFi. Thats just as quick as hooking into the LAN at least on my old PC. Anyways, once again why switching to the MAC is the best choice!