audio authority power supplies ?????

i got a dude in the area with a couple of 50 amp and 60 amp audio authority power supplies used from circuit city for their car stereo display . are these good power supplies ? im thinking they should be but at the same time they are probaly at least several years old and may have been on constantly for that time . ill check the manufactures date on the info on the back to check though .

i can only find info on the 100 amp version ....

audio authority power supplies ?????