I just installed it, working with a 30 day trial disk I got as a developer.
Hopeing I get a free key from the boys at M$ next time they come to visit.
Anywho, Good news Aero is Sweet and it works on my POS, im always loosing which page is which etc, now i can just flip thru without opening them with windowskey+tab ....Thats niice..
Bad news my Motherboard is SOOO old that mr intel gave me the finger and threw me on the "screw you buddy, buy a new computer" list.
So no sound, but everything else seems to work nice.
important part, havent tried any games yet, but will do soon. Prob not tonight but by the weekend for sure.
Search funtion is smooth and fast, Ive gotten very reliant on the Live messengers search as of late and this is perfect for me, saves alot of time clicking thru folders.
So so far, its a nice OS with some pretty new functions, the security is pretty standard fare for most antivirus/firewall proggies and the speed increase and graphics boost has also been noted.
All and all, worth the price of the full install disk, meh dont know, but for the nerd in us all the upgrade disk(considering you can do a full install with it

) is a good price.