I'm not sure if they are, but if you are unsure then you should just use a more reputable company. Those kinds of sites usually all have the same prices.
http://www.offgamers.com/ Bought tons of keys from them. They are fast like max 15 mins after the payment is received.
its a really small difference, you are better off buying them from the official site or at the store, because there is no chance that there will be a problem and if there is it is an easy ring to blizzard, those companies will not refund keys, only use those sites if you have no other choice. you can always try right here on sythe, you can get a way better price and you can prove to the seller that if it doesn't work hope this helped
I just did it here. IT worked I had to call and she has broken english, so it was hard, but I still got it.
