Well, you have to consult with their customer support for more in-depth information regarding the tests. I can't really tell what they scan and check only judging by the titles, but I do think that those tests should be sufficient enough in order for you to be able to determine of the drive is faulty or not.
Most diagnostic tools feature quick/generic and long/extended (and whatever other names they might be called) tests. Usually the extended tests scan the drive sector by sector (which takes a really long time (of course, the larger the drive, the longer it takes)) in order to determine if there are bad sectors.
