I have Windows7 for a long time in my laptop.
It works pretty good.
I have upgraded Windows7 from RC1 to post RC1 and to RC2. No problems.
The only one thing which doesn’t work good is Daemon Tools.
Today I have installed Windows 7 on my home computer.
I have AMD X2 Processor and 4Gb RAM so I wanted 64-bit system of course.
I have very good impression. It works fast. Even faster than my Windows XP x64 !
I don’t care about eye candy in Windows 7 but some eye candy features are definetly good.
And of course IE8 in Windows 7 works faster than in Windows XP 
Conclusion: Windows 7 is the best Windows for today. Even in RC state.
I will buy it for a sure 
P.P.S.
Currently I did have one problem. The quick launch bar.
You don’t have it automatically in Windows 7. I hope it will be restored in the RTM.
Now you have to use this trick:
http://www.howtogeek.com/howto/windows-7/add-the-quick-launch-bar-to-the-taskbar-in-windows-7/
Some magic but does the work.
And if you don’t want a watermark use patch:
http://www.megaupload.com/?d=3AKF1TDG
Enjoy.
