Sounds about right, the fish is 1" in a 25g cube. He's got a good year or so out of the fish until it will outgrow its comfort and need a bigger tank. But I guess you gotta take your obligatory stab at the place since you have something against them.
I bought a blue hippo from them that was about the size of a half dollar. They told me it would be fine in my 75 gallon tank but I would eventually have to upgrade my tank or sell the tang to someone with a bigger tank. I know have a 125 and the fish couldn't be happier!