Totally agree with Woody, I also had no Problems with loading Drivers or old printers in the early tests. However cannot say if its possable in the Final.
I do disagree with the fact that its only £25. If you read the posting from our FE on Oct 30. By installing it invalidates the original licence so the OS you have upgraded from cannot be reused.
My advice is be sure before upgradeing. If your Old OS system cannot be reused and activated. It may result in a lot more than £25 to replace it.
No one as yet posted as to if they removed the offical upgrade and retured to the original, without activation problems