I had a 2.4 MBP unibody for a couple of weeks when they first came out last fall. It had some issues like waking up randomly, problems dealing with an external monitor, and a couple of times the screen would go black with a weird band of colors and the audio would go full code. That was freaky.
I got this current 2.66 a week ago and it has NONE of those problems.
I think the battery life is slightly better, too. To me it seems like less of a new release prone to teething pains than it does a more refined minor revision.
In other words, I think that Apple really got its sh*t together with this one.
John