I have an authenticator and I absolutely love it! Only difference though is that I bought mine from Amazon.com for about 20 bucks, since Blizz was all sold out of them when I tried to buy one from them. I rely on my authenticator every time I login to WoW. It's saved me a ton of grief. I've been hacked at least twice in the past, so I know the pain. Ever since linking my account to my authenticator, though, I have had 0 problems! The only thing is that I wish the authenticator would have a backlit LCD display. It's very hard to read the numbers in low lighting situations. Perhaps Blizzard will put out a newer model with backlighting in the near future.