I have been using Windows 7 RC for some time and I am happy to report that it is stable, it is also more compatible than Vista. In fact I am playing games that wouldn't even run in XP on my computer for the first time in years. The Compatibility option now seems to work, now thats a plus.
There are a couple of problems however.
1) Most games that fail are the fault of the copy protection rather than the game, easy fixed with No-CD patch. Some game companies and copy protection providers are willing to help. However, companies like Atari and Codemasters have decided they have your money so why should they worry.
2) Some apps like tune-up and AV programs can be problematic as they are designed to work in harmony with the OS. Symantec have always been notoriously slow in sorting this sort of problem out. Kaspersky
and Zone Alarm
are both Windows 7 compatible. As far as I know the new Tuneup is also compatible. But I have many apps that work fine.
What you waiting for Windows 7 is a massive step forward and is the way Vista should have been in the first place. Personally I think M$ should give every Vista owner a free copy of Windows 7 as compensation, but who care what I think, lol.