It's still windows...
I have Windows XP in vmware, but my friend with an MSDN account gave me a key for Windows 7 Ultimate so I thought "Eh, why not"...
I have a Mac Pro 2.66 quad with a 1.5 TB hd, 2x 500s in raid 0 (boot drive), a 320 gig drive and a 320 gig ATA drive on the 2nd CD rom cable.
So I partition the drive I want to install it in using Boot Camp. I boot into the Windows installer and it lists all the drives. I select the partition. No go. I format the partition. Windows says No. Apparently it wants to act like a dog and mark any drive it sees with it's stench, but can't write to HFS drives. So I unplug every damn drive but the destination. Finally it's happy.
Windows 7 installs and much of the hardware is picked up. Windows update. Reboot. Download AIM client, screen flickers black and 2nd and 3rd monitors shut off "are you sure you want to install this?" Yes I am.
Sound is low on my speakers. Install BootCamp 3 drivers from Snow Leopard. Reboot. Sound now only comes out the front speaker of my Mac Pro, a common issue which I've found no solution for.
I install Steam... Download game demo. Download free game I got with my Radeon 4870. Go to install free game. Screen flickers, "are you sure.." Yeah I'm sure. Ok. Installing direct X for windows...wait....wait...wait...wait...nothing...close installer and hit 'launch' again. Are you sure? Yeah I am. OK, step 2 of three something with microsoft C++ library redirection blah blah wait wait wait wait.....hung..kill installer, hit launch again "are you sure?" YES installing games for windows live...wait wait error box red X can't go on until other installer is done! I quit the other installer. Try again, no go.
HEY YOU, INSTALL AN ANTIVIRUS RIGHT AWAY!! Ok show me windows 7 antivirus software....not free not free not free norton bloat AVG free but eh..avast ok give me that. Install....reboot....
Click goofy windows logo start menu...whats new in windows 7...hmmm I was thinking the same thing. Oh videos, cool. Big play button on this video....need windows media plugin something...oh ok....download plugin...save...run setup "Are you SURE?" *bang head* yes, run. You've got a later version of windows media already installed....
*SIGH* Shut down...
Shutting down ...wait....wait...wait....wait....wait...wait....wtf? Power button, reboot.
OS X, and I'm home again. Ahhhhh.
This is on a Windows 7 install with virtually nothing on it. On a 5.6 rated Windows experience box (HD speed and slower EEC ram drag me down a bit)....
I work in IT for a living. I run OS X and Linux at the Office. Windows 7 is *STILL* Windows.