I switched mine over awhile back and have had no problems - cept for once when they announced that everyone with BNet accounts would have problems for a little while while they did some work or something.  I like how I can &quot;remember username&quot; on the sign-on screen now for all three of my accounts since they all use the same signon name.  Easier, and better security practice as well since I no longer have to type the username and password both to log on.