I installed Windows 7 yesterday, and I have to say I am impressed.
It took me a bit to like Vista, but now I love it. It has it cons of course, but XP had them too.
Some games still don't run fin on Vista, but run great on XP.
As for 7, I like it better than Vista. I like the task bar, and the OSX style. Yes, I said it!! Everyone was thinking about it
It is a heavy monster. I installed in a Optiplex 330, with a E4400 Intel 2Ghz with an Intel G31 video processor. I got a base Score of 2.8 (because of graphics), but I was surprised that the disk performance is 5.4, while at home is 5.5 (and I have raptors).
My network audit software detects it as Windows 7, and it was not able to read the screen saver patch, and the Auto Update options, meaning they changed some settings (the network scanning is thru Newt Pro).
I installed McAfee Enterprise VSE 8.5 patch 8, and it detects it as Vista with OS version 6.1, but OS build 7100. The installation failed the first time.
I have the PC joined to the domain, since that is what I wanted to test the most.
I installed Office 2007, and it installed fine.
Granted I had to re-configure the firewall to scan the PC remotely and to install the antivirus since I deploy from the server. and I love the firewall. The rule base reminds me of checkpoint. It seems complicated, but really it is easier. After inspecting the rules for 30 minutes, I enabled what I needed in 2 secs. There already were rules for what I needed (respond to ping in domain, and allow file sharing in domain).
One note, is that the security policy did not sync by itselft. I had to run gpupdate /force from the cmd to update the policy.
Bit defender took 15 minutes to scan the system (with only office installed) and the AV took 1:45 to scan the whole system.
VSE 8.5 SP8 does not report to Windows 7 in the new format so there is an item in the action center.
One detail is that the defragmenter is not eanymore in the Computer Management (just like in Vista) and they should have put it back.
The point that I like the most is the installation.
It was very similar to Windows 2008. I don't remember Vista since I did it long ago, but I believe 7 took about 30 minutes to give me the desktop after install, and this is in not a speedy hardware.
Once is out I am planning to go to 7 on my PC at home. I currently have Vista Ultimate but 1 year license from the Vista Launch. with luck, I will make it at about the same time