I’ve tried on multiple systems (either 3 or 4), but any attempt to upgrade runs for over an hour, and ultimately fails after one of the various reboots where you get the screen with the frowny emoticon saying it couldn’t be done.
On the bright side, it rolls back properly so you don’t have a hosed system. Trying to find out the cause of the failed upgrade is a hoot. You have to trundle through C:\$WINDOWS.~BT\Sources\Panther and other places. It looks like there are multiple errors like:
Error [0x08038d] MIG Failure while calling IPostApply->ApplySuccess for Plugin={ServerPath="%windir%\system32\migration\nlscoremig.dll", CLSID={36af497c-c440-4282-a59e-02ed63498b7c}, ThreadingModel=Apartment}. Error: 0x80004005
No, I have no idea what that means either. There are a bunch of them, and it looks like if the error count is greater than one, it rolls back. Not when it encounters the first error, that would make sense, but at the end of the entire process. Fun.