Pleasantly surprised by the installation experience on my Dell XPS M1530. I was especially blown away by how it actually got my network card to work and find nearby wireless networks during the installation. Usually the first painful steps after a Windows installation is loading the network drivers from a USB stick, and trying to connect to your WLAN. Now it worked before installation was even done, so it could start grabbing updates instantly. Awesome.
It recognized nearly all my hardware right away, except the fingerprint scanner (the driver for which automatically came down Windows Update on the first search). The only things I had to install manually were the touchpad driver (it wouldn't recognize the scrolling area before) and I had to install Nvidia drivers before Aero Glass would work.
Messenger is a disaster by default though. First thing I did was run it in Vista compatibility mode so that it'd use the old system tray method again. And why does Windows Live Mail still use that system tray icon when it uses the overlay icons too?
Those were the only drawbacks though. Other than that it's smooth sailing so far.