I have tried a few versions of Windows 7 from 7100 to the current one and I love it as an OS but I am having lag problems with gaming, single player only. It's not on all games but ones that I play a lot of - Civilization 3, EA Sports Cricket 2007 and one or two others, they all are a couple...
My main pc is using Windows 7 64 bit build 7100, my kids pc is using XP Pro. Previously we had the networking with my main pc using Vista working perfectly, the XP pc could print on the printer connected to my pc, since I put Windows 7 on this pc I have the networking with file sharing etc...