One of my work machines now runs Win 7. It’s the first time I’ve had to do more than play with it.
It helps to know OS X, but it also hurts. There’s a lot of stuff in Win 7 that’s a tasteless and ugly version of OS X. Take the desktop themes (please).
Hard to say if it’s really an aesthetic improvement even over XP. The XP interface feels light, sharp and clear by comparison.
Update: For example - "Program Files (x86)". Thousands of Google hits puzzling over that one. WTF were they thinking?
Update 2/4/10: OS X managed a smooth migration to 64 bit. I've had a few days of experience with the Win 7 mix of 32 and 64 bit ODBC, Oracle, Java, Microsoft Office, SQL Developer, etc. It's a train wreck. It brings back memories of early DOS experiences. This 2007 tech doc tells one part of the dreadful story.