I think windows 7 would be a good OS after XP basing on so many testing until now. I am still using windows xp and wait for microsoft to release windows 7.
Windows 7 is easy to use and it's a totally bug free so that is advantage for every user
I believe it's a law of software engineering that it is impossible for a piece of software to be truly bug free. I doubt Microsoft has discovered the secret to violating this law.
Windows 7 no doubt better than Vista in everyway except some incompatibility issues but that will be fixed after final RTM. Since it is based on the Windows Vista kernel most of the Vista drivers work well or require little modification. Windows7 is head and shoulders above Vista!
I recently got my retail version of Window 7 through msdn.
I'm going to go with windows 7 simple because of the cool theme & the speed is much better than vista.