Just upgraded to PRO without any problems. Dowloaded drivers fron Samsung Website
Then just installed fresh PRO to c: (having first reformatted partition c: during install from CD) leaving d: intact and recovery area as well (just in case)
Then installed drivers using their setup files one at a time, mind blowingly simple and a lot better now I have Microsoft Exchange which was the main purpose of upgrading. All Samsung software works as before including FN keys and Samsung recovery III. Makes Sammy even better with no loss in speed etc.