Windows 7 is Vista with a new paint job, so it stands to reason it will be more stable in the early stages.
The current beta release, however, has been lambasted for being a bigger turd than Vista is. It is a grab bag of controversy. Opinions flying in every direction from the cuurent crop of testers. Microsoft wants everyone to beleive it is smaller and faster and they have gone to great lengths to build special versions of the OS to show it will run on machines that the released versions of Vista will not.
Except, none of the beta releases of Windows 7 has been able to duplicate what the Microsoft marketing machine has claimed it could do.
I would not get my hopes up, as it does not appear Microsoft has listened to anyone, and Windows 7 is just an attempt to change the name of Vista hoping to shake the bad reputation Vista has earned.
But, it is not a released product yet, so I am willing to wait and see. I am just highly skeptical Microsoft will do anything that is good for the computer user, given who is leading the Microsoft machine at the moment.