I tried it on my laptop:
after installing you can't get windows update anymore.
wireless settings are easier at first but then if you need to configure it will bring you good old screen off all those options you had on xp sp1
It hase pop up blocker but i have it too

It won't let you open web page from your hd saying it might be dangerous so you need to adjust settings to let you work on it.I think links where blocked or something.
Security wont recognize my antivirus even i have it on PC.It states no antivirus software found in the security panell window.
Adds a security icon on task bar.Like i have not enough icons already.
-----------------------------Uninstalled---------------------------------