I don't think they're as aggressive and vicious as their reputation would lead you to believe. We found the presentation and talk to be very informative, and left the Devils @ Cradle park with a much better understanding of the Tasmanian Devils.

The majority of the captive Tasmanian Devils are quite tame, and many can be handled by the staff at the Devils @ Cradle facility.

During her educational talk, one of the staff members was holding an adult Tasmanian Devil inside, and we all had an opportunity to pat it.

However, one of the male Tasmanian Devils, named Hugo, has a reputation for being agressive, and the female staff member has a scar on her leg where Hugo bit her.
We witnessed Hugo's agression when the staff member was in the enclosure. Hugo would agressively approach her, and the staff member would revert to Devil behaviour by screeching to try to intimidate Hugo. Hugo made several attempts to bite the staff member, and she fended him off with her thick-soled boots.

Note that the behaviour of Hugo is the exception - the other Tasmanian Devils are quite happy to tolerate the staff in their enclosures, and many of the Devils will tolerate being handled by the staff.